As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEADING SELECT BUG WILL NOT MOVE WHEN HEADING SELECT KNOB IS TURNED. ACFT GROUNDED. REPLACED MODE CONTROL PANEL IAW AMM 22-11-34-00-801 AND 22-11-34-400-801. ACCOMPLISHED MCP INSTALLATION TEST IAW AMM 22-11-34-740-801. ALL TESTS PASSED.