What was found
(CAN) A FACTORY REPAIRED PROPELLER CONTROL UNIT (PCU) HAVING SERVICE BULLETINS 14RF-9-61-22, -26, -32, -34, -38, -43, -45, -51, -60, -61 INCORPORATED WAS INSTALLED ON THE #2 ENGINE DURING A 400 HOURS/400 CYCLE INSPECITON ("A" CHECK). DURING RUN-UP FOR SERVICEABILITY CHECK, THE #2 ENGINE/PROPELLER EXPERIENCED AN UNCOMMANDED AUTOFEATHER UPON MOVING THE PROP OUT OF GROUND IDLE POSITION. THE PCU WAS REMOVED AND RETURNED TO THE FACTORY FOR REPAIR AND INVESTIGATION.