What was found
(CAN) AIRCRAFT IN CRUISE FLIGHT. PILOT NOTICED NG FLUCTUATION BETWEEN ENGINES, FOLLOWED BY ENGINE AT NR 2 CHIP LIGHT AND AN UNUSUAL NOISE & HOWL. PILOT SHUTDOWN NR 2 ENGINE AND MADE UNSCHEDULED LANDING AT NEARBY AIRPORT. NR 2 ENGINE COMPRESSOR SAGS FOUND WORN 2 1/2 BEARING IN GEARBOX. ALSO ENGINE COMPRESSOR SAGS FOUND WORN. NO PREVIOUS CHIP LITES REPORTED AND SYSTEM CHECKED OK. AT PREVIOUS 100 HOUR INSPECTION (TIME SINCE INSPECTION 55 HOURS APPROXIMATELY).