As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE FIRE LOOP LIGHT DID NOT TEST. WHILE PERFORMING RESISTANCE CHECKS ON THE #2 ENGINE LOOP A DETECTORS NOTICED RESISTANCE CHANGES WHEN THE FIRE DETECTOR HARNESS WAS MOVED OR DISTURBED. REPLACED THE FIRE LOOP HARNESS AND #2 FIRE LOOP LIGHT TESTED OK.