What was found
DURING LEVEL OFF AT FL 230, THE RT ENGINE FAILED TO RESPOND TO THROTTLE MOVEMENT. CREW USED LT ENGINE INFLIGHT. THE F/O DID THE CHECKLIST FOR SURGE/LIMIT AND GOT NO RESPONSE FROM THE RT ENGINE. CREW DID LANDING CHECKLIST AND LANDED WITH THE RIGHT THROTTLE AT IDLE POSITION. MAINTENANCE RAN BOTH ENGINES AT VARIOUS THROTTLE COMMANDS AND AT SAME SPEEDS TO COMPARE. BOTH ACTED THE SAME WITH NO DISCREPANCIES. REPLACED FUEL CONTROL UNIT, ENGINE ELECTRONIC CONTROL, LOGPAGES 6479241 AND 6479242, AND FUEL PUMP IAW AMM. PERFORMED OPS CHECK IAW AMM. ENGINES MADE TAKEOFF POWER. ALL PARAMETERS NORMAL.