What was found
AUTOPILOT "B" INOPERATIVE IN VERTICAL SPEED MODE. OPERATES NORMALLY IN ALL OTHER MODES. AUTOPILOT "A" OPERATES NORMALLY IN ALL MODES. ACFT GROUNDED. CONFIRMED FAULT, MCP VERTICAL SPEED CH B FAILS MCP INTERACTIVE TESTS MSG 22-11063. ACCOMPLISHED FIM 22-11, TASK 817 AND RECONFIRMED MCP FAULT. REPLACED MCP IAW AMM 22-11-34. ACCOMPLISHED DFCS LRU INTERFACE TESTS, GP 32, IAW AMM 22-11-34/501, DFCS LAND VERIFY TEST (GP 49) IAW AMM 22-11-00/ 201, AND HGS SENSOR TEST IAW SMM 34-36-00, OPS CK NORMAL.