As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 410 AUTOPILOT B FLYING (LNAV/VNAV ENGAGED): AIRCRAFT BANKED LT AT APPROX 20 DEGREES/SECOND. IMMEDIATELY DISCONNTECTED AP. RECONNECTED AP B AFTER NOT FINDING ANY FMC ABNOMALITIES. NO FURTHER PROBLEMS WERE OBSERVED. PERFORMED DFCS BITE TESTS IAW 22-11-00 AND NO FAULTS FOUND. CHECKED GOOD.