As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BNA - CREW REPORTED LEFT ENGINE OIL FILTER CLOG LIGHT ILLUMINATED. THERE WAS SOME TYPE OF VIBRATION FELT BY THE FLIGHT CREW AND FLIGHT ATTENDANT WHICH WENT AWAY WHEN ENGINE WAS BROUGHT BACK TO IDLE. EMERGENCY DECLARED FLIGHT LANDED BNA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED LEFT ENGINE AT BNA ON 05/02/2012. SYSTEM GROUND CHECK NORMAL OPERATION.