As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON A IFR TRAINING FLIGHT AIRCRAFT EXPERIENCED UN-COMMANDED ROLL AND PITCH MOVEMENTS WITH NO CAUTION LIGHTS OR MESSAGES. AUTOPILOTS DISENGAGED (REVISION TO FLIGHT MANUAL). NOTE: MAINTENANCE DID NOT FIND A CAUSE FOR THE UNCOMMANDED MOVEMENTS.