As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN TOGA SELECTED #2 THRUST LEVER DID NOT ADVANCE, FOLLOWED BY AUTOMATIC AUTOTHROTTLE DISENGAGEMENT. GROUNDED - YES. TESTED TOGA SWITCH REF B737-800 AMM 22-11-39, GROUND VERIFICATION NORMAL. ACCOMPLISHED AUTOTHROTTLE OPERATIONAL TEST AND AUTOTHROTTLE SYSTEM TEST REF AMM 22-31-00, GROUND VERIFICATION NORMAL. NO FAULTS FOUND.