What was found
ON TAXI OUT BEFORE TAKE OFF THE CREW OF A NEARBY AIRPLANE REPORTED 2-3 FOOT FLAMES COMING OUT OF THE #1 ENGINE. TAILPIPE FIRE CHECKLIST COMPLIED WITH AND RETURNED TO GATE. NO INDICATIONS ON ON TAXI OUT BEFORE TAKE OFF THE CREW OF A NEARBY AIRPLANE REPORTED 2-3 FOOT FLAMES COMING OUT OF THE #1 ENGINE. TAILPIPE FIRE CHECKLIST COMPLIED WITH AND RETURNED TO GATE. NO INDICATIONS ON THE FLIGHT DECK. VO FIRE OR OVERHEAT WARNINGS AND ENGINE INDICATIONS NORMAL<[01] T/S PER FIM 71-05-811. FOUND OIL PUDDLED IN EXHAUST PLUG. CLEANED OIL REF AMM 72-00-00. RAN ENGINE REF AMM 71-00-00. OK FOR SERVICE.