What was found
WHILE ROTATING THE RIGHT PROPELLER TO DRESS PROPELLER BLADES AN UNUSUAL NOISE WAS HEARD. A STANDARD AERO TECHNICIAN WAS CALLED IN. THE RIGHT HAND ENGINE POWER SECTION WAS REMOVED AND DISMANTELED. FOUND ROTOR BALANCING ASSEMBLY. NR 3 BEARING P/N:3032208 TO HAVE CHATTER MARKS ON THE OUTER RACE. NR 3 BEARING REPLACED WITH NEW UNIT P/N:3032208 S/N:BB0042763. ENGINE REASSEMBLED, ENGINE GROUND RUNS COMPLETED SATISFACTORY, AIRCRAFT RETURNED TO SERVICE.