What was found
DURING TAXI OUT, MCP ALITTUDES LOCKED UP AND NO CHANGES COULD BE MADE. BOTH FDS WERE INOPERATIVE, AND SPEED WINDOW COULD NOT BE CHANGED. A/TS WOULD NOT ARM EITHER. ACFT GROUNDED. RESET POWER TO MCP. PERFOMED MCP TEST IAW FIM 22-11-00-810-803. TEST PASSED. DUE TO HISTORY, TECH SERVICES REQUESTED FOLLOW UP. REPLACED DFCS MCP REF MM22-11-34, OPS CK NORMAL. ALSO ACCOMP DFCS LRU MCP NR 32 TEST, MCP 60.16 TEST, LAND VERIFY NR 49 TEST, & HGS SENSOR FCC/AT TEST. ALL TEST NORMAL REF MM22-11-34, 22-11-00, & SMM34-36-00.