What was found
CREW REPORTS ON TAKEOFF ROLL, 3/4 KNOB SPLIT, RT ENG AHEAD OF LT ENG THRUST LEVER, DID MAKE TAKEOFF POWER. DURING CLIMB, AT FL300, UNABLE TO ATTAIN CLIMB POWER. RT THRUST LEVER AT FIREWALL 1 INCH LOSS OF THROTTLE RESPONSE AT THRUST LEVER SETTINGS. THE FLIGHT RETURNED TO FIELD & LANDED WITHOUT FURTHER INCIDENT. ACFT WAS REMOVED FROM SERVICE. REPLACED THE NR 2 ENG MEC.