As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEADING BUG LOCKED ON HEADING 110 AIRBORNE. CYCLED BOTH F/D AND TURNED OFF AUTOPILOT WITH NO CHANGE ALT AND SPEED BUGS WORKED NORMAL. AFTER LANDING HEADING NOW SHOWS 117. ACFT GROUNDED. OPS CHECKED MODE CONTROL PANEL HEADING SELECTOR KNOB IAW AMM 22-11-34, OPS CHECKED NORMAL.