diff --git a/src/python_testing/TC_RR_1_1.py b/src/python_testing/TC_RR_1_1.py
index 026220c9ceb9ba..1f691b8e925ab9 100644
--- a/src/python_testing/TC_RR_1_1.py
+++ b/src/python_testing/TC_RR_1_1.py
@@ -75,12 +75,19 @@ async def test_TC_RR_1_1(self):
         skip_user_label_cluster_steps = self.user_params.get("skip_user_label_cluster_steps", False)
         # Whether to do the local session ID comparison checks to prove new sessions have not been established.
         check_local_session_id_unchanged = self.user_params.get("check_local_session_id_unchanged", False)
+        # Whether to check heap statistics. Add `--bool-arg check_heap_watermarks:true` to command line to enable
+        check_heap_watermarks = self.user_params.get("check_heap_watermarks", False)
 
         BEFORE_LABEL = "Before Subscriptions 12345678912"
         AFTER_LABEL = "After Subscriptions 123456789123"
 
         # Pre-conditions
 
+        # Do a read-out of heap statistics before the test begins
+        if check_heap_watermarks:
+            logging.info("Read Heap info before stress test")
+            high_watermark_before, current_usage_before = await self.read_heap_statistics(dev_ctrl)
+
         # Make sure all certificates are installed with maximal size
         dev_ctrl.fabricAdmin.certificateAuthority.maximizeCertChains = True
 
@@ -406,6 +413,14 @@ async def test_TC_RR_1_1(self):
                 num_fabrics_to_commission, fabric_unique_clients, group_key_map, groups_cluster_endpoints, indicated_max_groups_per_fabric)
             await self.validate_group_table(num_fabrics_to_commission, fabric_unique_clients, group_table_written)
 
+        # Read heap watermarks after the test
+        if check_heap_watermarks:
+            logging.info("Read Heap info after stress test")
+            high_watermark_after, current_usage_after = await self.read_heap_statistics(dev_ctrl)
+            logging.info("=== Heap Usage Diagnostics ===\nHigh watermark: {} (before) / {} (after)\n"
+                         "Current usage: {} (before) / {} (after)".format(high_watermark_before, high_watermark_after,
+                                                                          current_usage_before, current_usage_after))
+
     def random_string(self, length) -> str:
         rnd = self._pseudo_random_generator
         return "".join([rnd.choice("abcdef0123456789") for _ in range(length)])[:length]
@@ -619,7 +634,7 @@ def build_acl(self, fabric_number, client_by_name, num_controllers_per_fabric):
         # - Subjects field: [0x3000_0000_0000_0001, 0x3000_0000_0000_0002, 0x3000_0000_0000_0003, 0x3000_0000_0000_0004]
         # - Targets field: [{Cluster: 0xFFF1_FC40, DeviceType: 0xFFF1_FC20}, {Cluster: 0xFFF1_FC41, DeviceType: 0xFFF1_FC21}, {Cluster: 0xFFF1_FC02, DeviceType: 0xFFF1_FC42}]
         # . struct
-        # - Privilege field: View (3)
+        # - Privilege field: View (1)
         # - AuthMode field: CASE (2)
         # - Subjects field: [0x4000_0000_0000_0001, 0x4000_0000_0000_0002, 0x4000_0000_0000_0003, 0x4000_0000_0000_0004]
         # - Targets field: [{Cluster: 0xFFF1_FC80, DeviceType: 0xFFF1_FC20}, {Cluster: 0xFFF1_FC81, DeviceType: 0xFFF1_FC21}, {Cluster: 0xFFF1_FC82, DeviceType: 0xFFF1_FC22}]
@@ -666,7 +681,7 @@ def build_acl(self, fabric_number, client_by_name, num_controllers_per_fabric):
                                                                                     targets=operate_targets)
         acl.append(operate_acl_entry)
 
-        # Operate ACL entry
+        # View ACL entry
         view_subjects = [0x4000_0000_0000_0001, 0x4000_0000_0000_0002, 0x4000_0000_0000_0003, 0x4000_0000_0000_0004]
         view_targets = [
             Clusters.AccessControl.Structs.Target(cluster=0xFFF1_FC80, deviceType=0xFFF1_BC20),
@@ -701,6 +716,25 @@ def build_group_key(self, fabric_index: int, group_key_index: int, keys_per_fabr
                                                                      epochKey2=self.random_string(16).encode(),
                                                                      epochStartTime2=(set_id * 4 + 2))
 
+    async def read_heap_statistics(self, dev_ctrl):
+        diagnostics_contents = [
+            Clusters.SoftwareDiagnostics.Attributes.CurrentHeapHighWatermark,
+            Clusters.SoftwareDiagnostics.Attributes.CurrentHeapUsed,
+        ]
+        diagnostics_paths = [(0, attrib) for attrib in diagnostics_contents]
+        swdiag_info = await dev_ctrl.ReadAttribute(self.dut_node_id, diagnostics_paths)
+
+        # Make sure everything came back from the read that we expected
+        asserts.assert_true(0 in swdiag_info.keys(), "Must have read endpoint 0 data")
+        asserts.assert_true(Clusters.SoftwareDiagnostics in swdiag_info[0].keys(
+        ), "Must have read Software Diagnostics cluster data")
+        for attribute in diagnostics_contents:
+            asserts.assert_true(attribute in swdiag_info[0][Clusters.SoftwareDiagnostics],
+                                "Must have read back attribute %s" % (attribute.__name__))
+        high_watermark = swdiag_info[0][Clusters.SoftwareDiagnostics][Clusters.SoftwareDiagnostics.Attributes.CurrentHeapHighWatermark]
+        current_usage = swdiag_info[0][Clusters.SoftwareDiagnostics][Clusters.SoftwareDiagnostics.Attributes.CurrentHeapUsed]
+        return high_watermark, current_usage
+
 
 if __name__ == "__main__":
     default_matter_test_main(maximize_cert_chains=True, controller_cat_tags=[0x0001_0001])