As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH ON FLIGHT 3145 CREW REPORTED BELOW 2500 RADIO ALTITUDE CAPTAIN DISCONNECTED THE AUTO PILOT USING THE QUICK DISCONNECT BUTTON. THERE WAS NO AUTOPILOT, AUTOPILOT AURAL WARNING. THE ACFT WAS REMOVED FROM SERVICE. ACCOMPLISHED AUTOPILOT FUNCTIONAL CHECK IAW AMM 22-11-00. COULD NOT DUPLICATE THE PROBLEM ALL CHECKED FOUND TO BE SATISFACTORY.