As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - INFLIGT DFW-SLC. CREW REPORTED BOTH AUTO-PILOTS FAILED DURING FLIGHT. FLIGHT DIVERTED DEN LANDED WITHOUT INCIDENT. PLACARD BOTH AUTOPILOTS AS INOPERTAIVE PER MEL. REPLACED AUTOPILOT AILERON SERVO AT ORD ON 03/07/2012 . SYSTEM GROUND CHECK NORMAL OPERATION.