What was found
RIGHT ENGINE POWER LEVER STUCK - ON LANDING ROLLOUT, ATC GAVE CLEARANCE TO MAKE NEXT LEFT TURN. THE RIGHT SEAT PILOT ADVANCED THE RIGHT THROTTLE TO ASSIST THE TURN. WHEN HE ATTEMPED TO RETARD THE THROTTLE IT STUCK ABOUT HALF WAY. PIC GRABBED THE RIGHT THROTTLE AND IT FREED UP. PIC PULLED THROTTLE ALL THE WAY BACK INTO CUTOFF AND HEARD A LOUD BANG. AIRCRAFT BROUGHT TO STOP AND TOWED TO RAMP. INSPECTED THE THROTTLE LINKAGES WITH NO DEFECTS NOTED. INSPECTED THE THROTTLE QUADRANT AND FOUND A PAPER CLIP WEDGED IN THE RT THROTTLE LEVER. REMOVED PAPER CLIP. EXERCISED THE RH THROTTLE SEVERAL TIMES AND NO BINDING NOTED. RAN ENGINES WITH NORMAL PARAMETERS. ADVANCE AND RETARD RT THROTTLE WITH NO BINDING OR NOISE. OPS CHECKED GOOD. CLOSED RT LOWER COWLING. INSPECTED THE EMERGENCY BRAKE/GEAR BOTTLE AND VERIFIED PILOT DID NOT DISCHARGED. WORK DONE IAW AMM 76-10-00 AND 76-11-01.