What was found
PIT - FLT 1451 - ON CLIMB-OUT FROM PIT, EN ROUTE TO PBI, CREW REPORTED THE STABILIZER TRIM WAS INOPERATIVE IN BOTH ELECTRIC AND MANUAL. FLIGHT RETURNED TO FIELD AT PIT AND LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE R63 PHASE SEQUENCE RELAY, THE R64 STABILIZER TRIM CONTROL RELAY, P/N 9123-8071, AND THE R66 STABILIZER TRIM SAFETY RELAY, P/N 9123-8071. OPS CHECK GOOD. (M)