As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB T THROTTLE MOVED BACK TO 86 PERCENT N1 UNCOMMANDED. RUDDER BOOST WAS INITIATED AND THE THROTTLE WOULD NOT ADVANCE FURTHER. ACFT RETURNED TO THE DEPARTURE AIRPORT SAFELY. A SIMILAR PROBLEM HAD BEEN REPORTED ON THE PREVIOUS FLIGHT WHICH RESULTED IN THE REMOVAL AND REPLACEMENT OF THE RT AFT THROTTLE CABLE. MX DISCOVERED THE OTBD THRUST REVERSER STOW SWITCH FAILED.