As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DIVERTED DUE TO AN AIRFRAME VIBRATIONS BETWEEN THE AFT LAVATORIES. UNEVENTFUL LANDING. LEFT ENGINE ANTI-ICE VALVE MOUNTING BOLT WORN AND LOOSE. REMOVED AND REPLACED WITH NEW HARDWARE IAW AMM 75-10-01. OPERATIONAL CHECK GOOD. AIRCRAFT WAS GROUNDED.