As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO THROTTLES WILL SET TAKEOFF AND CLIMB POWER BUT WILL NOT RETARD THROTTLES TO MAINTAIN SPEED. DURING CRUISE PDC SPEED IS THE ONLY MODE THAT WORKS. MCP SPEED MODE WILL NOT WORK IN ANY REGIME. ADJUSTED AUTO THROTTLE SWITCH. OP'S CHECKS OK.