As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE OVERHEAT DETECTOR LOOP B, NOT TESTING CORRECTLY. FAULT LIGHT ILLUMINATED. ACFT GROUNDED. FOUND BROKEN TERMINATION AND CHAFING ON UPPER LEFT DETECTOR NR 2 WIRING. REPLACED THE NR 1 ENGINE FAN HARNESS, UPPER & LOWER FAN FIRE DETECTORS, AND ORE HARNESS IAW AMM 26-11-02/401. OPS CHECKED GOOD IAW AMM 26-11-00-710-801.