What was found
IN FLIGHT FROM SAP TO MIA "NOSE DOWN RUNAWAY TRIM" AND "JAM STABILIZER AFTER RUNAWAY TRIM". MAINTENANCE FOUND THE STABILIZER TRIM WHEEL MOVING IN THE SAME DIRECTION AT ALL TIMES REGARDLESS OF THE POSITION OF THE STABILIZER CRUISE TRIM SWITCH. THE AUTOPILOT STABILIZER TRIM SERVO WAS REPLACED AND THE STABILIZER TRIM SYSTEM CHECKED NORMAL IAW THE B727 AMM. IN ADDITION THE STABILIZER JACKSCREW WAS INSPECTED FOR FOREIGN OBJECTS ON THE CABLE DRUM, SPROCKETS, BALL NUTS LACK OF LUBRICATION DAMAGE OR WEAR. NO DISCREPANCIES WERE FOUND. HOWEVER THE JACKSCREW WAS CLEANED AND LUBRICATED PER THE AMM AND THE AIRCRAFT RETURNED TO SERVICE.