As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENG BREAD BAND VIBRATION INDICATOR ENTERED & REMAINED IN AMBER BAND. CREW CONDUCTED COMPULSORY LT ENG SHUTDOWN IAW QRH. CREW REPORTED THAT THEY DIDN'T FEEL ANY VIBRATION. EICAS MX MSGS LT ENG BB VIB & LT ENG VIB BITE PRESENT, SUSPECTED INDICATION. R & R RED LT ENG AVM ACCELEROMETER IAW AMM 77-31-01-4. R & R RED LT ENG AVM SIGNAL CONDITIONER IAW MM 77-31-03-4. NEED TO PERFORM HIGH POWER RUN. PERFORMED AVM SYS OPERATIONAL TEST IAW AMM 77-31-00-5-0 AT 70 PERCENT N1. PERFORMED LT ENG VIBRATION SURVEY TEST 6 IAW AMM 71-00-00-5-3.