What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ON TAXI OUT, AN AIRCRAFT BEHIND US REPORTED VISIBLE FLAMES INSIDE THE AFT PART OF THE NUMBER TWO ENGINE, ON AND OFF FOR OVER A MINUTE. MAINTENANCE REPORTS NO DAMAGE NOTED AFTER CANDLE EVENT IN EXHAUST PLUG CAVITY, IAW FIM 71-00-00-800-803-F00. ACCOMPLISHED ENGINE RUN. INSPECTED FOR OIL ACCUMULATION IN EXHAUST PLUG CAVITY IAW FIM 71-00-810-811-F00. NO EXCESS OIL ACCUMULATION NOTED. ENGINE RUN NORMAL. NO FLAMES NOTED.