As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3877 ON THE LANDING ROLL OUT THE CREW TRIED TO STOW THE THRUST REVERSERS BUT THE LEFT REVERSER STAYED DEPLOYED. THE CAPTAIN DECLARED AN EMERGENCY WITH AIR TRAFFIC CONTROL. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED AN OPERATIONAL CHECK IAW CRJ 700 MM 78-30-00. NO PARTS REMOVED OR REPLACED. THE OPERATIONAL CHECK WAS GOOD. NO DEFECTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.