As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE #1 LOOP A ENG OVERHEAT WILL NOT TEST. GROUNDED - YES. FOLLOWED B737-800 FIM 26-10 TASK 805 FOR ENGINE- WIRING HARNESS/FIRE DETECTOR. FOUND INCONSISTENT READING BETWEEN CONNECTOR DP1501 AND DP1552. REMOVED AND REPLACED FAN FIRE DETECTION HARNESS REF B737-800 AMM 26-11-02-000/400-801. ACCOMPLISHED ENGINE FIRE DETECTION OPERATIONAL TEST REF AMM 26-11-00-710-801. NO FAULTS FOUND. ALL TESTS PASSED. ALL GROUND VERIFICATION TESTS SUCCESSFUL.