diff --git a/tests/domain/sap10_calculator/rdsap/test_golden_fixtures.py b/tests/domain/sap10_calculator/rdsap/test_golden_fixtures.py
index 49f66e24..8ac38714 100644
--- a/tests/domain/sap10_calculator/rdsap/test_golden_fixtures.py
+++ b/tests/domain/sap10_calculator/rdsap/test_golden_fixtures.py
@@ -391,11 +391,19 @@ _EXPECTATIONS: tuple[_GoldenExpectation, ...] = (
             "P960 worksheet exactly (roof 29.17, SAP 65.04 vs 65). The "
             "glazing hypothesis from the prior handover was wrong — maxing "
             "the glazing U past spec can't flip 69→68, and every per-bp "
-            "fabric U is spec-plausible. The residual +0.92 cont SAP is a "
-            "diffuse demand under-count (window split + Main suspended-"
-            "timber floor) not capturable from the API-only JSON; needs a "
-            "fully-faithful 7536 worksheet (in progress) to localise or "
-            "conclude it is 0240-like."
+            "fabric U is spec-plausible. CONCLUSION (cases 15/16/17, the "
+            "last faithful on windows 16.98/13.59/1.89 + ground floors): "
+            "every per-element value matches Elmhurst — walls 0.70/0.28/"
+            "0.40, roofs 0.40/0.18/0.68, window U-eff 2.4368/1.8519, "
+            "ground floors Main 0.97 / Ext1 0.26 / Ext2 1.12. The only "
+            "worksheet divergences were manual-entry artifacts (case 16 "
+            "floor-order inversion; case 17 spurious 'to external air' "
+            "exposed floors auto-derived from the small-ground/big-upper "
+            "geometry — real 7536 lodges floor_heat_loss 2/7/3 = unheated-"
+            "space/ground, NOT code 1 exposed). The residual +0.92 cont "
+            "SAP is therefore 0240-like: an Elmhurst register-rounding "
+            "residual not reproducible from the API-only JSON. DO NOT "
+            "chase further — leave at resid +1."
         ),
     ),
     _GoldenExpectation(