As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT 360 IN STRAIGHT & LEVEL FLIGHT. AP DISCONNECTED & BEGAN A RIGHT TURN & A 400 FT DECENT FLIGHT CREW CORRECTED & RETURNED TO CRUISE COURSE & ALT, NO AP AURAL WARNING WAS NOTED. RECONNECTED AP & IT WORKED NORMALLY WE DISCONNECTED IT MANUALLY & HERD THE AURAL WARNING, THEN WE LEFT THE AUTO PILOT OFF FOR REMAINDER OF FLIGHT. R & R IC600 IAW AMM 31-42-00. THIS ACFT IS RVSM ELIGIBLE & ACFT ELIGIBLE FOR CONTINUOUS CAT II OPERATIONS.