As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3251 - AT FL350 ENGINE NR 1 FAILED WITH NO INDICATIONS. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE ASSY, COMPLIED WITH OPERATIONAL CHECKS AND ACFT WAS RELEASED TO SERVICE. *S/D* TEARDOWN REPORT: CAUSE OF THE UNCOMMANDED IN FLIGHT SHUTDOWN WAS A BEVEL GEAR FAILURE.