What was found
AIR RETURN DUE TO FALSE APU FIRE WARNING BOTTLE WAS FIRED. AIRCRAFT MADE AN UNEVENTFUL LANDING. INSPECTED APU AREA AND NO EVIDENCE OF FIRE FOUND. DEFERRED DETECTION AND EXTINGUISHING SYSTEMS PER BOEING MM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR RETURN DUE TO FALSE APU FIRE WARNING BOTTLE WAS FIRED. AIRCRAFT MADE AN UNEVENTFUL LANDING. INSPECTED APU AREA AND NO EVIDENCE OF FIRE FOUND. DEFERRED DETECTION AND EXTINGUISHING SYSTEMS PER BOEING MM.