As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UN-COMMANDED HARD RIGHT ROLL WITH AUTOPILOT ON. CAPTAIN OVERCAME THE ROLL BY FORCING THE CONTROL TO THE LEFT. AUTOPILOT DID NOT DISCONNECT. ACFT THEN ROLLED TO THE LEFT UN-COMMANDED. CAPTAIN FORCED THE CONTROL TO THE RIGHT TO CENTER THE ACFT. AP REMAINING ON-LINE.