As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ENROUTE AFTER ABOUT 2 HOURS INTO FIGHT, THE APU AGENT DISCHARGE LIGHT CAME ON THE OVERHEAD WITH NO MANIPULATION ON PILOTS PART FOR A FEW MINUTES THEN WENT OFF. NO OTHER INDICATIONS. MAINTENANCE PERFORMED A SATISFACTORY OPERATIONAL CHECK OF THE APU FIRE DETECTION SYSTEM PER AMM 26-13-00 WITH NO ISSUES NOTED.