What was found
AIRCRAFT WAS GROUNDED: VERY SLIGHT UNCOMMANDED RUDDER MOVEMENT DURING DECENT AT APPROXIMATELY 4500FT, DFDR EVENT PB PRESSED SECDS LATER. MAINTENANCE ACCOMPLISHED A GENERAL VISUAL INSPECTION OF THE RUDDER CONTROL SYS & FOUND RUDDER NEUTRAL POSITION DID NOT ALIGN WITH THE REFERENCE TRIANGLE & CENTERING ROD OUT OF LIMITS AT LOW TRAVEL RANGE DUE TO THE CENTERING ROD BEING WORN. REPLACED CENTERING ROD & ADJUSTED THE RUDDER NEUTRAL POSITION PER AMM 27-21-48-401 AND AMM 27-24-00-820-001-A. REPLACED THE RUDDER TRAVEL LIMITER UNIT PER AMM 27-23-51-400-001-A. REPLACED RUDDER TRIM ACTUATOR AND ACCOMPLISHED A RUDDER TRIM ADJUSTMENT PER AMM 27-22-00-820-001-A.