As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AIRBORNE DISCHARGE LIGHT ILLUMINATED ON APU FIRE BOTTLE AFTER APPROX. 4 HOURS INTO FLIGHT. LIGHT EXTINGUISHED 10 MINUTES BEFORE LANDING. MAINTENANCE ACCOMPLISHED APU FIRE LOOP/SQUIB TEST PER AMM 26-22-00 WITH NO FAULTS NOTED.