What was found
WITH R A/P ON, A/C WENT FROM A 2000 FPM TO A 4500 FPM RATE OF DESCENT. APPROACHING LEVEL OFF ALT PF CLCK IS OFF A/P AND HAND FLEW REMAINDER OF ARRIVAL AND APPROACH REPEAT GRIPE ON A/P SYSTEM. IDENTIFIED PARTS FLT MGMT COMPUTER MPN: 4052506-955 CPN: 3414772 QTY: 1. CHANGE PARTS QTY FLT MGMT COMPUTER. QTY: 2 COMPUTER. PERFORMED GVI INSPECTION ON ALL THREE ELEVATOR NEUTRAL SHIFT ROTARY TRANSDUCERS AND FOUND NO OBVIOUS DAMAGE AND/OR LOOSE CONNECTIONS OR ITEMS, NO CURRENT FAULTS IN 30 TEST. REPLACED BOTH (LEFT AND RIGHT) FMC'S IAW AMM 34-61-01-4-2 AND PERFORMED 30 TEST WITH NO FAULTS AND 40 A/L TEST ALSO WITHOUT FAULTS.