What was found
FIRE BELL WENT OFF WITHOUT ANY MAP LIGHTS INDICATION WHILE APU WAS RUNNING ON THE GROUND AFTER 5 MIN. REPLACED AURAL WARNING UNIT WITH SERVICEABLE UNIT. OPS CHECK GOOD. S/N OFF 0411.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FIRE BELL WENT OFF WITHOUT ANY MAP LIGHTS INDICATION WHILE APU WAS RUNNING ON THE GROUND AFTER 5 MIN. REPLACED AURAL WARNING UNIT WITH SERVICEABLE UNIT. OPS CHECK GOOD. S/N OFF 0411.