As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE 1, ENGINE OVERHEAT LIGHT DOES NOT ILLUMINATE DURING TEST. GROUNDED - YES. CONFIRMED FAULT, NO. 1 ENGINE FIRE/OVHT WILL NOT TEST. FOUND INTERMITTENT DEFECTIVE (M1757) UPPER FAN FIRE DETECTION LOOP. REMOVED & REPLACED SAME PER B737-800 AMM 26-11-01, GROUND FUNCTIONAL CK NML REF AMM 26-11-00-710-801.