What was found
SHIP 9548 -ATB/DE- THE FLIGHT WAS RETURNED TO ATL DUE TO THE LOSS OF THE PRIMARY STABILIZER TRIM. ON DEPARTURE CLIMB OUT, THE CAPT NOTICED THAT THERE WAS NOT ANY DOWN TRIM AVAILABLE. UP TRIM WORKED FINE. ALTERNATE TRIM WAS USED SUCCESSFULLY TO CORRECT PITCH DOWN. AN EMERGENCY WAS DECLARED WITH ATC AND THE F/A WERE BRIEFED ON YELLOW EMERGENCY. THE LANDING WAS UNEVENTFUL. CORRECTIVE ACTION: MAINTENANCE REPLACED MULTIPLE RELAYS AND THE STABILIZER TRIM MOTOR. OPERATIONAL CHECKS WERE ALL GOOD AND THE AIRCRAFT HAS RETURNED TO SERVICE. (LP #4825460)