As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE INDICATION AND SMELL OF SMOKE IN CABIN AND COCKPIT---INSP APU AREA. NO SIGNS OF FIRE OR FUEL LEAKS. PERFORMEDAPU START UP. ISNP AGAIN NO DEFECTS NOTED. ADDITIONAL MX-- PERFORMED OPS CHECKS OF PACKS WITH AND WITHOUT ENG RUNNING, NO SIGNS OF SMOKE IN CABIN OR COCKPIT.