As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 5840416) 30 SECS AFTER SHUTDOWN, GROUND CREW NOTIFIED US OF A SUSPECTED TAILPIPE FIRE ON ENG #1. REFERENCED QRH AND MOTORED ENGINE USING APU. FLAMES EXTINGUISHED. NO COCKPIT INDICATIONS OF ABNORMALITY WERE NOTED. PERFORMED INSPECTION AND ENGINE RUN PER B737 FIM 71-05-00-810-811-F00, FAULT ISOLATION PROCEDURE. NO LEAKAGE OR DEFECTS NOTED.