What was found
DURING CRUISE FLIGHT WITH AUTOPILOT ELEVATOR SERVO "A" ENGAGED, ACFT HAD PITCH OSCILLATIONS GREATER THAN PLUS/MINUS 2 DEGREES INTERMITTENTLY. OSCILLATIONS SEEMED MORE PRONOUNCED DURING TURBULENCE OR WHEN ELEVATOR WAS LOADED IN A TURN. A/P SERVO INDICATOR SHOWED DEFLECTIONS MATCHING THE OSCILLATIONS ONLY ON THE RT ELEVATOR WITH DEFLECTIONS OF PLUS/MINUS .2500 IN. PREFORMED ELEVATOR POSITION AND TRIM SENSOR WIRING AND LINKAGE INSPECTION CHECK,FOUND LT POSITION SENSOR SHORTED. R & R SENSOR IAW AMM 22-11-071-4.