As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AT TOP OF DESCENT , APU AGENT DISCHARGE LIGHT ILLUMINATED APU OFF LIGHT WENT OUT ON FINAL APPROACH. MAINTENANCE ACCOMPLISHED TSM 26-22-00-810-806-A AND FOUND THE PRESSURE SWITCH CONNECTOR LOOSE FROM THE APU EXTINGUISHER BOTTLE, CLEANED CONNECTOR AND RE-CONNECTED IT PER AMM 26-22-00. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED.