As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE WITHIN 3 MILES OF (1R4), WHILE EN ROUTE TO SENDING FACILITY AN AUDIBLE FIRE TONE SOUNDED FOR LESS THAN A SECOND WITH NO FIRE LIGHT OR OTHER INDICATIONS ASSOCIATED WITH IT. I ELECTED TO CANCEL AND RETURN TO BASE. ON RIGHT BASE TO LAND THE FIRE CHIME SOUNDED AGAIN FOR LESS THAN A SECOND WITH NO LIGHT OR OTHER INDICATIONS ASSOCIATED WITH IT. (COULD NOT DETERMINE WHICH ENGINE THE SOUND WAS ASSOCIATED WITH.)