As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT B WILL NOT ENGAGE. GROUNDED - YES. CONFIRMED FAULT, A/P B WILL NOT ENGAGE. FOUND AFCS SYS B ENGAGE INTLK C/B AT P6-2 WILL NOT RESET. TROUBLESHOT TO DEFECTIVE MCP & FOUND 3 EA LAMINATED CREW CHECK LISTS WEDGED BEHIND MCP. OVERHEATING MCP. REMOVED ALL CHECK LISTS, REMOVED & REPLACED MCP REF AMM 22-11-34. ACCOMPLISHED MCP INSTALLATION TEST REF AMM 22-11-34-740-801, DFCS MCP TEST REF AMM 22-11-34/501, DFCS LAND VERIFY TEST (GP 49) REF AMM 22-11-00 & HGS SYSTEM TEST REF SMM 34-36-00, OPS CK NML.