What was found
AUTOPILOT A DISCONNECTED DURING CLIMB FOR NO APPARENT REASON. AUTOPILOT A WAS REENGAGED AND OPERATED FINE FOR ABOUT AN HOUR. THEN WHILE AT CRUISE, AUTOPILOT A DISCONNECTED AGAIN, AND AGAIN FOR NO OBVIOUS REASON. AUTOPILOT A WAS REENGAGED AND OPERATED FINE. AUTOPILOT B WAS ENGAGED FOR THE NEXT HOUR AND OPERATED FINE. A/P A WAS THEN REENGAGED, AT CRUISE, AND OPERATED FINE FOR REST OF FLIGHT. ACFT GROUNDED. FAULT HISTORY ON FCC A & B SHOWS FAULT MSG 22-11607. REMOVED MCP AND INSPECTED DISCONNECTS. NO FAULTS NOTED. REINSTALLED MCP. REPLACED FCC A PRECAUTIONARY DUE TO DISCONNECTING DURING FLIGHT. ALSO INSPECTED PLUGS AND PINS BEFORE INSTALLATION. NO FAULTS NOTED. ACCOMPLISHED OPS TEST OF FCC AND MCP. ALL TEST GOOD. REF MM 22-11-34 AND 22-11-33 FOR WORK PERFORMED.