As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SELECTING A NEW HEADING WHILE IN HDG MODE, THE A/C CONTINUED TURNING THROUGH THE NEW HEADING (OPPOSITE THE FLIGHT DIRECTOR COMMANDS) AND THEN JERKED SUDDENLY TO THE LEFT TWICE. THE A/P DISCONNECTED ON ITS OWN. REMOVED AND REPLACED FCC NR 1 IAW MM 22-12-1A. OP CHECKS GOOD. P/N 622-9815-704, S/N ON 642, S/N OFF 13N2T.