What was found
(LOG 6943068) ON ARRIVAL ACS NOTICE SMALL FLAME ON ENG 1 EXHAUST. FLIGHT CREW PERFORM DRY MOTOR TO SUCCESSFULLY BLOW OUT TAILPIPE FIRE. PERFORMED AFTER ENG FIRE INSPECTION REF B737 71-00-00-800-803-F00, FIRE/SMOKE LOCATED INSIDE THE EXHAUST PLUG OF THE ENGINE FOUND TO BE DUE TO OIL ACCUMULATION IN THE EXHAUST PLUG CAVITY. FLAME ARRESTOR VISUAL INSPECTION CHECKS GOOD, HONEYCOMB PRESENT NOT DETERIORATED, ENGINE SERVICEABLE. PERFORMED ENGINE IDLE RUN REF 71-00, OPS CHECK GOOD.