What was found
(CAN)ENGINE REPORTED MAKING "GRUMBLING" NOISES. METAL CONTAMINATION OF THE OIL FILTER AND METAL FLAKES ON THE TURBOMACHINE CHIP DETECTOR. #5 BEARING FAILED DUE TO FAILURE OF ONE SEPARATOR OF THE BEARING CA GE ALLOWING ONE ROLLER TO MOVE OUT OF POSITION AND SKIDDING OF THAT ROLLER. NO OBVIOUS REASON FOR THE CAGE FAILURE. THIS BEARING HAD BEEN REPLACED 2994 HOURS PREVIOUS FOLLOWING A HP STUBSHAFT BOLT FAILURE.