As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTENT, BOTTLE LOW, CAUTION LIGHT ON FIRE PANEL (APU) RESULTS IN MASTER WARNING AND CHECK FIRE DETECT WARNINGS. REMOVED JUMPER AND RECONNECTED CONNECTOR 2600-P26 TO ADP. COULD NOT DUPLICATE FAULT. R & R APU FIRE EXTINGUISHER AS A PRECAUTIONARY MEASURE IAW AMM TASKS 26-23-01-000-801 AND 26-23-01-400-801. OPS TEST GOOD. RETURNED TO SERVICE.