As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THEY WERE UNABLE TO CONTROL THRUST SETTING IN FLIGHT. ON TAKEOFF ROLL THE THRUST SETTING WENT TO "E/T/O RESERVE". THE POWER THRUST RATINGS KEEP CHANGING RANDOMLY. THE ACFT RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT, WHERE MX REPLACED THE THRUST SETTING MODULE SWITCH BOX, PERFORMED OPS CHECKS AND CLEARED THE DISCREPANCY.