As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, CREW REPORTED AUDIBLE BOOM, RUMBLE & LOSS OF FUEL FLOW ON LT ENG. SHUTDOWN LT ENG. EMERGENCY DECLARED, RETURNED TO DEPARTURE AND LANDING WAS UNEVENTFUL. R & R LT ENGINE. POWER PLANT ENGINEERING REPORTS NR 4 BEARING FAILED.