As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 281 - HNL - APU 'A' LOOP LIGHT AND FIRE DET LOOP LIGHT CAME ON MOMENTARILY IN FLIGHT. APU WAS NOT RUNNING AT THE TIME. SELECTED THE 'B' LOOP. ELECTED NOT TO START THE APU. CLEANED APU FIRE DETECTION 'A' LOOP CONNECTOR. CHECKED CANNON PLUG AND CLEANED. TESTED APU FIRE DETECTION ON GROUND, CHECKED OK. (M)