What was found
ON FLIGHT 3368 THE CREW REPORTED THAT DURING DESCENT, AT HIGH SPEED I.E. 310 KIAS, CAPT INCLINOMETER SHOWED 1/2 BALL WIDTH TO THE LEFT. INCLINOMETER WAS UNRESPONSIVE WITH UP TO 1 FULL WIDTH YAW TRIM LEFT EVEN AFTER DISCONNECTING AUTOPILOT + Y/D. AFTER SHOWING AROUND 270 KIAS OR LESS LEFT RUDDER AUTHORITY RETURNED AND FUNCTIONED NORMALLY FOR REMAINDER OF FLIGHT WITH AUTOPILOT AND Y/D STILL DISCONNECTED. THE CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED RUDDER HYDRAULIC PCU IAW EMB 145 AMM 27-22-03. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.