As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - FLT 3386 - UNCOMMANDED PITCH MOVEMENTS IN-FLIGHT WITH OR WITHOUT AUTOPILOT. VERIFIED THE FLAPS DID NOT APPEAR TO BE MOVING. REMOVED AND REPLACED THE FLIGHT CONTROL COMPUTER. OPERATIONAL CHECK AND TEST FLIGHT PERFORMED WITH NO FURTHER PROBLEMS NOTED. AIRCRAFT RETURNED TO SERVICE. (X)