As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNCOMMANDED TURN BY AUTOPILOT WITHOUT INPUT. FLT 5332 TROUBLE SHOT AUTOPILOT SYS, NO SIGNIFICANT MDC FAULTS FOUND. SERVO SPIN TEST GOOD, RAN THE NAV TESTER & HEADING WORKS FINE WHEN ENGAGED. COULD NOT DUPLICATE, AUTOPILOT OPERATIONS CHECKED GOOD IAW AMM.