What was found
ON FLIGHT 4513 - THE CREW REPORTED THE ELEVATOR FLUCTUATED IN MODERATE TURBULENCE. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE ELEVATOR AUTO PILOT SERVO IAW EMB 135 AMM 22-11-04-000-801 / 22-11-04-400-801-AUTO PILOT FUNCTIONAL TEST GOOD ON GROUND-PERFORMED GVI OF ELEVATOR CONTROL SURFACES AND VISABLE CABLES & QUADRANTS AFT EQUIPMENT & AVIONICS COMPTS-NO VISABLE DISCREPANCIES NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.