What was found
FLT JB477 BOS-OAK AIRCRAFT HAD 3 UNCOMMANDED PITCH DOWNS WITH LOSS OF 100 FT NO ASSOCIATED ECAMS/FLIGHT CONTROL FAULTS. AIRCRAFT WAS AT CRUISE AT FL360/.78MACH WITH AUTO PILOT 2 ENGAGED STRAIGHT AND LEVEL IN SMOOTH AIR, MANUAL THS PITCH TRIM WHEEL MOVED RAPIDLY FORWARD WITH EACH OF THE PITCH DOWNS. MX REMOVED AND REPLACED THS ELECTRONIC MODULE IAW AMM 27-41-00-05 AND MONITOR TRANSDUCER UNIT IAW AMM 27-44-57-000-002 TEST PASSED IAW AMM 27-41-00-730-001. ACCOMPLISHED LAND CAT LLL TEST IAW AMM 22-97-00 PASSED. AIRCRAFT RETURNED TO SERVICE.