As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT WITH CA FD AS MASTER AP KICKED OFF COULD NOT ENGAGE HEADING MODE , COULD NOT ENGAGE LNAV. RECOVERED BY PUTTING FD 2 ON AS MASTER AND LNAV/VNAV ON WITH B AUTOPILOT. CA HEADING BUG FROZEN ENTIRE TIME. NO LOC,NO GS DIAMONDS ON CA PFD. AT GS CAPTURED, CA FD CAME BACK ON , BUT STILL CA HEADING BUG FROZEN, NO LOC, NO GS DIAMONDS ON CA PFD. GROUNDED - YES. REMOVED & REPLACED MCP IAW AMM 22-11-34/401. PERFORMED MCP INSTALLATION TEST IAW AMM 22-11-34-740-801. PERFORMED DFCS VERIFY TEST IAW AMM 21-11-00. OPS CK NORMAL.