As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE LINE MAINTENANCE, IT WAS DISCOVERED THAT THE RT THRUST REVERSER NR 1 BLOCKER DOOR HINGE ARM HAD BROKEN RESULTING IN DAMAGE TO THE SURROUNDING STRUCTURE. IT IS ASSUMED THE DAMAGE OCCURRED DURING THE LAST THRUST REVERSER DEPLOYMENT.