As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT B DISCONNECTED 3 TIMES AT CRUISE. ABLE TO RECONNECT AFTER EACH EVENT. FAULT CODE 221 090 00. ACFT GROUNDED. PERFORMED DFCS BITE IAW FIM 22-11 TASK 801. NO FAULTS. FLT LEG 1 HAS FAULT - MCP DATA INV - MSG 22-11607. PERFORMED FIM 22-11 TASK 817. NO FAULTS. MODE CONTROL PANEL TESTED OK IAW FIM 22-11 TASK 803.