What was found
FLT 0279 - AFTER LANDING AT IAH INBOUND FROM PHX, AFTER ENGINE SHUTDOWN AT GATE, GROUND CREW OBSERVED FIRE IN THE TAILPIPE OF THE NR 1 ENGINE. FLIGHT CREW MOTORED ENGINE APPROXIMATELY 1 MINUTE BEFORE FLAME EXTINGUISHED, ESTIMATE TAILPIPE FIRE LASTED TOTAL OF 2-3 MINUTES. THERE WERE NO FIRE WARNING OR OVERHEAT INDICATIONS ON FLIGHT DECK. MAINTENANCE INSPECTED THE NR 1 ENGINE, NO OIL WAS FOUND POOLING IN THE TAILPIPE, AND NO LEAKAGE AT THE NR 7 TURBINE BLADES. PERFORMED ENGINE RUN, OPERATIONAL CHECKS WERE GOOD.