As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO THROTTLE DISENGAGED ON TAKEOFF WHEN TOGA BUTTON WAS PRESSED. AUTO THROTTLE ARM SWITCH RELEASED TO OFF AND RED AUTOTHROTTLE ALERT LIGHT FLASHED UNTIL RESET. TRIED TO RE-ENGAGE AUTO THROTTLE ON TAKE OFF, CLIMB AND CRUISE WITHOUT SUCCESS. GROUNDED - YES. PERFORMED FIM 22-31TASK 801 SYSTEM OP CHECKS GOOD NO DEFECTS NOTED AT THIS TIME. PERFORMED LLM TEST REFERENCE AMM 22-00-01 NO DEFECTS NOTED. AIRCRAFT IS HGS/AUTOLAND QUALIFIED.