As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/T WILL NOT STAY ENGAGED. GROUNDED - YES. ACCOMPLISHED AUTOTHROTTLE SYSTEM - OPERATIONAL TEST REF B737-9 AMM 22-31-00-710-801. NO FAULTS. ALL TESTS PASSED. ACCOMPLISHED LAND VERIFY TESTS REF AMM 22-00-01. ALL TESTS PASSED. GROUND VERIFICATION SUCCESSFUL.