What was found
FLT 4127 - DURING CLIMB-OUT FROM ATL-PFN, THE CREW RECEIVED AN AC WILD FAULT ON THE RIGHT ENGINE. WHILE PERFORMEING THE CHECK LIST THE CREW NOTICED THE RIGHT ENGINE TORQUE AT 38-40 PERCENT AND THE NP AT 108 PERCENT. THE CREW REDUCED THE RIGHT ENGINE POWER TO FLIGHT IDLE AND THEN ATTEMPTED TO LOWER THE NP BY SETTING THE POWER TO CLIMB WITHOUT SUCCESS WITH THE NP REMAINING AROUND 110 PERCENT. THE CREW THEN SHUT DOWN THE RIGHT ENGINE, DECLARED AN EMERGENCY AND THE AIRCRAFT RETURNED TO ATL, LANDING SAFELY. MAINTENANCE REMOVED AND REPLACED THE RIGHT ENGINE PROPELLER SERVO VALVE (PSV). OPS AND LEAK CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)