What was found
DURING THE LANDING ROLL WITH THRUST REVERSERS DEPLOYED NR 1 ENGINE FAILED. GROUNDED - YES. INSPECTED & FOUND 5TH STAGE CHECK VALVE STUCK OPEN. REPLACED CHECK VALVE. LEAK CHECKED GOOD, REF AMM 36-11-02. ACCOMPLISHED TEST 5 POWER ASSURANCE CHECK. TEST ENGINE LIMITS GOOD 65, 70, 75% N1. DURING THROTTLE BACK ENGINE COMPRESSOR STALLED AT APPROXIMATELY 60% N1 WITH EGT 560 C, ADVANCED THROTTLE. COMPRESSOR STALL ENDED BUT REPEATED AGAIN WHEN REDUCING THROTTLE. WAS ABLE TO PREVENT STALL BY SLOWLY REDUCING TO IDLE, REF AMM TASK 71-00-700-813-F00. REPLACED NR 1 ENGINE PER T/C 78471000& 78471001. RAN ENGINE, NO DEFECTS NOTED.