What was found
RECEIVED RED STABLIZER WARNING ON INITIAL POWER APPLICATION DURING PREFLIGHT STAB TRIM SET TO 6.75. CONFIG T/O CHECK PERFORMED 3 TIMES. AFTER WARNING, STAB INDICATED (AN UNCOMMANDED MOVE) TO 7.1 OR 7.2. CONCLUDED WE HAD UNCOMMANDED MOVEMENT OF APPROX 1/3 UNIT. IDENTIFIED PARTS CTR STAB TRIM LIMIT SWITCH MPN: 9000428-19 CPN: 2718194 QTY: 1 IDENTIFIED PARTS PRINTED CRCT ASSY, TAKEOFF MPN: 285T0259-19 CPN: 3111459 QTY: 1 PERFORMED OPS CHECK FOR M620, OPS CHECKS GOOD, REF AMM 31-51-04-4. REMOVED AND REPLACED CTR STAB POSITION TRANSMITTER MODULE.