What was found
RECEIVED APU FAIL AFTER FIRST START ATTEMPT. AFTER WAITING 5 MINUTES WE TRIED STARTING A SECOND TIME. DURING START GROUND CREW REPORTED SMOKE AND FLAME. NO INDICATION OF FIRE IN FLIGHT DECK. REMOVED FROM SERVICE. CDS SHOWS NO CURRENT FAULTS. C/W APU START PROCEDURE IAW AMM TASK 49-00-00-869-801. APU STARTS NORMAL. NO DISCREPANCIES FOUND. APU OKAY FOR CONTINUED SERVICE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.