What was found
@ FL340 NUMBER 1 ENG. N. BEGAN ROLLING BACK W/ A/T DISENGANGING. THROTTLE MANUALLY RETARDED TO 35 DEGREES/N1, ENG PARAMETERS FOLLOWS NORMALLY. @FL310 THROTTLE REPONSE WAS NORMAL, ENGINE RECOVERED A/T RE-ENGAGED ALL ENGINE INDICATION NORMAL FOR REMAINDER OF FLIGHT / REMOVED AND INSTALLED SERVICEABLE HMU #1 ENGINE, PER MT 773-21-10. PERFORMED LEAK CK, AND POWER ASSURANCE RUN PER AMM 71-00-00 TEST 5 OP'S CK'S WITHIN LIMITS RAR # 69444 P/N OFF 1853M56P14 P/N ON 442653 S/N OFF BECW2814 S/N ON BECW1476