What was found
CABIN PRESSURE ISSUE AFTER VIBRATION FELT, CABIN ALTITUDE STARTED RISING. IT ROSE PAST 8900 CAB ALT THEN EICAS WARNING POPPED. AT 35,000 FT IN CRUISE, WE FELT VIBRATIONS COMING FROM THE LEFT SIDE. WE THEN LOOKED AT THE ENG VIB EICAS INDICATION - IT READ 1.7 ON HP. VIBRATION SOUNDED LIKE HIGH PRESSURE AIR SPUTTERING.WE DECLARED AN EMERGENCY AND DESCENDED RAPIDLY TO 10,000FT. THEN DIVERTED TO MLU. NO INJURIES LANDED SAFELY. PERFORMED BOTH ENGINE RUNS PER GE LMM 72-00-00. OPC GOOD. REF AML PG 107002214 FOR