As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE WARNING LIGHT AND AUDIO CAME ON TWICE DURING IN FLIGHT START OF APU BEFORE LANDING. EACH TIME IT CAME ON WAS ONLY FOR A BRIEF TIME, AND AFTER REDUCING SPEED TO 120 KNOTS IT STAYED OUT. EOP CHECKLIST CONSULTED AND IT APPEARED TO BE SPURIOUS INDICATIONS. MAINTENANCE CORRECTIVE ACTION: CLEANED FLAME DETECTOR CANNON PLUG. OPS CHECK TEST ON GROUND REF S92 AMM CH 26