What was found
ANOTHER AIRCRAFT OBSERVED FLAMES COMING OUT OF THE NR 1 ENGINE FOR ABOUT A MINUTE AFTER START. PERFORMED GENERAL VISUAL INSPECTION OF THE NR 1 ENGINE EXHAUST SECTION AND INLET, NO EVIDENCE OF ENGINE FIRE ON INBD FLAP ASSEMBLY OR PYLON. CREW REPORTED NO UNUSAL EGT OR SPIKE IN ENGINE EGT, CREW ALSO REPORTED NO FIRE WARNING MESSAGES OR AURAL WARNINGS. IAW EA7255-01044 REV C, REMOVED THE CENTER VENT TUBE. OBSERVED WEAR ON BEARING SURFACES FOR THE O-RING SEALS IN AFT 3 POSITIONS ON VENT TUBE. REPLACED THE NR 1 ENGINE.