What was found
ENGINE O/H FACILITY NOTIFIED OWNERS OF SPECIFIC ENGINES WITH A HIGH POSSIBILITY OF DEFECTIVE CAM ROLLERS AND AXLES THAT HAD BEEN INSTALLED WITH A HIGH INCIDENT OF FAILURE RATES. UPON DISASSEMBLY OF ENGINE, IT BECAME APPARENT THAT THIS ENGINE, INDEED, HAD DEFECTIVE PARTS INSTALLED. THE CAM RING HAD VISIBLE AND ADVANCED GALLING OF THE APPROACH RAMPS AND LOBES. AN OVERHAULED CAM RING WITH NEW ROLLERS AND EXHAUST AXLES WERE APPLIED BY COVINGTON ACFT AND ENGINE REASSEMBLED.