As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLES WILL NOT ENGAGE. ACFT GROUNDED. A/T CURRENT STATUS ATTEMPTED, A/T WILL NOT ENGAGE. FOUND THE NR 1 A/T SWITCH NOT CLICKING, SUSPECT BAD SWITCH. FAULT CONFIRMED WITH INPUT FAILED THE TEST. REMOVED AND REPLACED A/T DISENGAGE SWITCH. INSTALLATION TESTED GOOD, OPS TESTED GOOD IAW AMM 22-31-51 AND 22-31-00.