What was found
AT CRUISE AT FL400 FELT A VIBRATION IN PLANE. ABOUT A MIN LATER L ENG VIBRATION CASS MESS CAME ON. WHILE PULLING OUT QRH, RECEIVED A LT ITT EXCEEDANCE WARNING. BEGAN SMELLING SMOKE IN CABIN. PUT ON O2 MASK. RECEIVED A LT ENG FLAMEOUT CASS MESSAGE NEXT. RAN QRC FOR INFLT ENG SHUTDOWN & LANDED ON 1 ENG IN KMEM. REMOVED ENG WITH TSN: 6935.8 AND CSN: 4004 FROM NR 1. INSTALLED A REPAIRED ENG PN P136294 TSN: 10128.4 CSN: 6074 IAW LMM 72-05-22 & AMM 71-00-01-000-801. ACCOMPD POST-INSTALLATION ENG RUNS, SERVICED ENG & ATS WITH 2197 OIL, FUEL & OLL DE-PRESERVATION, GRND RAN FOR LEAK CHKD & POWER ASSURANCE RUN IAW LMM 72-05-22 & AMM 71-00-01-000-801. ADDED 1 CYCLE FOR PERFORMANCE RUN.