As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN AUTOPILOT IS SWITCHED FROM NAV/LOC TO HDG SELECT, THE A/C BANKS 20 DEGREES HARD IN THE OPPOSITE DIRECTION. FOUND ROLL CHANNEL FAILED. R&R ROLL CHANNEL. PERFORMED A/P ADJ TEST IAW MM 22-11-01. TESTED NORMAL IN A&B MODES VOR, NAV LOC & HDG SELECT MODES.