What was found
DURING TAXING OUT, THE NR 1 ENGINE EXPERIENCED COMPRESSOR STALL AND VIBRATION. AS THE NR 1 ENGINE EGT CLIMBED TO 750 DEGREES, THE CREW FOLLOWED COM PROCEDURE, SHUT DOWN THE ENGINE, AND RETURNED TO THE GATE WITHOUT FURTHER INCIDENT. REPLACED TT2 SENSOR, LEAK AND FUNCTIONAL TEST WERE NORMAL.