What was found
(CAN) ON RAMP AFTER M/R HEAD CHANGE MASTER CAUTION LIGHT ACTIVATED&ENGINE CHIP LIGHT ACTIVATED. ENGINEER FOUND ON REAR CHIP DETECTOR FOR ENGINE MINOR FUZZ. ENGINER CLEANED CHIP DETECTOR & REINSTALLED ENGINEER INSPECTED FILTERS & FOUND NO DISCREPANCY. A/C GROUND RUN&NO CHIP LIGHTS OCCURRED. AFTER TRACK & BALANCE. COUPLE HRS LATER ANOTHER ENGINE CHIP LIGHT. TIME MASSIVE AMOUNTS OF METAL. A/C SHUTDOWN. METAL GENERATION MAYBE COMING FROM NR 2 POWER SECTION OR COMBINING GEARBOX. ONCE POWER SECTION REMVD BEARING CAGE OF NR 5 DUPLEX BEARING IN TRANSITION AREA OF POWER SECTION&COMBINING GEARBOX. COMBINING GEARBOX REPLACED. TSO OF COMBINING GEARBOX 2126 HRS.