As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN ROTATING HEADING SELECTOR KNOB ON THE MCP, THE HEADING DISPLAYED AND THE HEADING BUG WILL SOMETIMES MOVE THE OPPOSITE DIRECTION OR NOT RESPOND. ACFT GROUNDED. REMOVED AND REPLACED DFCS MODE CONTROL PANEL IAW AMM 22-11-34. INSTALLATION TESTED GOOD. AUTOLAND NOT AUTHORIZED.