diff --git a/backend/documents_parser/tests/fixtures/pashub_accuracy/507639151845.pdf b/backend/documents_parser/tests/fixtures/pashub_accuracy/507639151845.pdf
index 2c6a8a218..b72df83c9 100644
Binary files a/backend/documents_parser/tests/fixtures/pashub_accuracy/507639151845.pdf and b/backend/documents_parser/tests/fixtures/pashub_accuracy/507639151845.pdf differ
diff --git a/backend/documents_parser/tests/fixtures/pashub_accuracy/manifest.json b/backend/documents_parser/tests/fixtures/pashub_accuracy/manifest.json
index 7db88f559..59b7c6c86 100644
--- a/backend/documents_parser/tests/fixtures/pashub_accuracy/manifest.json
+++ b/backend/documents_parser/tests/fixtures/pashub_accuracy/manifest.json
@@ -1091,8 +1091,8 @@
     {
       "deal_id": "507639151845",
       "uprn": null,
-      "pre_sap_raw": "C80",
-      "pre_sap_score": 80,
+      "pre_sap_raw": "C76",
+      "pre_sap_score": 76,
       "pdf": "507639151845.pdf"
     },
     {
diff --git a/backend/documents_parser/tests/test_pashub_sap_accuracy.py b/backend/documents_parser/tests/test_pashub_sap_accuracy.py
index 25d2d8009..bdc027c74 100644
--- a/backend/documents_parser/tests/test_pashub_sap_accuracy.py
+++ b/backend/documents_parser/tests/test_pashub_sap_accuracy.py
@@ -344,3 +344,25 @@ def test_walsden_pins_to_pashub_resurvey_sap_64() -> None:
         f"13 Walsden SAP {outcome.sap_continuous:.2f} diverged from the PAS Hub "
         "re-survey's own accredited 64 (NOT the colliding 24-Jun cert's 68)"
     )
+
+
+@pytest.mark.skipif(not _FIXTURES, reason="no pashub_accuracy fixtures/manifest")
+def test_paxton_fixture_is_v5_resurvey_sap_76() -> None:
+    """5 Paxton Place (deal 507639151845, uprn 10070864419) was RE-ISSUED: the
+    same PAS Hub survey (inspected 29 May/Jun 2026, report B74AA5A4-…) has two
+    accredited revisions — V2 (ventilation "Natural", SAP 80) and V5 (ventilation
+    "Mechanical Extract - Centralised", SAP 76, the current version). The
+    portfolio-838 oracle tracks the latest revision (76), so the fixture is
+    refreshed to the V5 PDF (2026-07-15e); our engine reproduces its accredited 76
+    (~75.6). Do NOT revert this fixture/manifest to the V2 SAP-80 version.
+    CAVEAT: `hubspot_deal_data.pre_sap` for this deal is still stale at "C80", so a
+    `scripts/build_pashub_accuracy_fixtures.py` rerun would regenerate the manifest
+    `pre_sap` back to 80 — this pin (asserting a literal 76 against the V5 fixture)
+    is the canary. Confirmed against pashub: April survey → SAP 76 (Khalim)."""
+    outcome = _evaluate("507639151845")
+    assert outcome.sap_continuous is not None
+    assert abs(outcome.sap_continuous - 76) < 0.5, (
+        f"5 Paxton SAP {outcome.sap_continuous:.2f} diverged from the current V5 "
+        "(MEV) re-survey's accredited 76 — has the fixture reverted to the V2 "
+        "(Natural, SAP 80) PDF?"
+    )