As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLE WILL NOT ENGAGE. ACFT GROUNDED . AUTOTHROTTLE CURRENT STATUS TEST PASSED. MULTIPLE AUTOTHROTTLE 28 VDC POWER INVERTER FAULTS LOGGED ON DIFFERENT LEGS. IAW SSM 22-31-51 VERIFIED GOOD VOLTAGE AT MCP CONNECTOR D301. REMOVED AND REPLACED MODE CONTROL PANEL IAW AMM 22-11-34, OPS CHECKED NORMAL.