As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PUSHBACK THE GROUND CREW REPORTED THE APU ON FIRE. NO INDICATION WAS GIVEN IN THE COCKPIT. AS CORRECTIVE ACTION CA PRESED THE APU FIRE PUSH. FIRE DEPARTMENT REPORTED NO FIRE AFTER INSPECTION. (FLT 4665) REPLACED APU ASSEMBLY. P/N: 3800488-3 S/N OFF: P-944