As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE BEARINGS IN THE THRUST REVERSER VALVE ACTUATING MECHANISM DETERIORATED ALLOWING THE P-DOME INSULATION BLANKET GUARD TO WEAR INTO THE P-DOME SKIN. ADDITIONALY, A SCREW ON THE VALVE CAM FOLLOWER CRANK ASSY WORE THROUGH THE P-DOME SKIN AND FWD DOUBLER. THE DAMMAGE IS AT Z=-23 AND RBL 35 ON THE STA 1338 P-DOME BULKHEAD. TWO DOUBLERS WERE INSTALLED ON THE FWD SIDE OF THE P-DOME PER ER/A 420372-14 TO REPAIR THE DAMAGE.