As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, NR 4 ENGINE THROTTLE ON REDUCED TAKEOFF, THRUST LEVER WAS BINDING AND HAD TO PUSH THROTTLE LEVER 1.5 KNOBS ABOVE THE OTHER THROTTLES TO SET POWER AND STILL COULD NOT REACH CLIMB THRUST. REMOVED AND REPLACED THROTTLE PUSH PULL CABLE AND PLA SENSOR IAW AMM 76-11-05 AND OPS CHECKED IAW 76-11-00. ALSO, PERFORMED TEST 4 PER AMM 71-00-00, OPS CHECKED NORMAL.