As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - INFLIGHT LAX-STL. CREW REPORTED LEFT ENGINE VIBRATION. EMERGENCY DECLARED DIVERTED LAS LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT ENGINE NOSE CONE FAIRING DUE TO A CRACK FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION.