What was found
AUTO PILOT-A WILL NOT ENGAGE. GROUNDED - YES. C/W DFCS BITE PROCEDURE, B737-800 FIM 22-11 TASK 801, BITE GRP #20 FAULT REVIEW, FOUND LEG 6 HAD MULTIPLE FAULTS FOR BOTH ENGAGE ATTEMPT AND A/P DISC FAULTS. MCP AIL ENG DISAGREE, FC 22-11625, MCP ELV ENG DISAGREE & FC 22-11626. SUSPECT LRU IS MCP. REF FIM 22-11-00-810-845 & FIM 22-11-00-810-846 REMOVED AND REPLACED MODE CONTROL PANEL (MCP). REF B737-800 AMM 22-11-34/401, OPS TEST GOOD.