What was found
IN CRUISE AND AT TOP OF DESCENT, AUTO PILOT DISCONNECTED A/C IN TRIM, NO PILOT INPUTS. GROUNDED - YES. DEBRIEFED CREW BOTH A & B DISCONNECTED MULTIPLE TIMES, A FCC FLIGHT FAULTS 22-11607, 22-11627, B FCC FAULTS 22-11607, 22-11627, ALL RELATED TO MCP-HAS HISTORY. XX 35534 8/29/22. DUE TO PAST MX HISTORY & MCP HAS BEEN REPLACED ON 08/22/2022, FOR PRECAUTION REPLACED BOTH FCC-A & FCC-B, PERFORMED INSTALLATION TEST GOOD, ALSO PERFORMED SATISFACTORY LLM MAINTENANCE TEST, ALL REQUIRES TESTS PASSED. REF 737-800 AMM 22-11-33-000-801 AND AMM 22-11-33-400-801.