What was found
AIRCRAFT WAS GROUNDED. STAB TRIM FROM CONTROL WHEEL OR AUTO PILOT INOPERATIVE. MANUAL TRIM WORKS. FLIGHT CONTROL AND SPEED TRIM FAILED ON INTERMITTENT DURING FLIGHT. A/C IS DIVERTING TO CLT ON ACCOUNT OF TRIM ISSUE. EMERGENCY DECLARED, FLIGHT WILL NOT LAND OVERWEIGHT. PERFORMED FIM 27-41-00-810-804 VERIFIED VOLTAGE TO TRIM MOTOR PINS 1, 2, 3. PER FIM REQUIRES REPLACEMENT OF STAB TRIM MOTOR. REPLACED STAB TRIM MOTOR PER AMM 27-41-71.