What was found
INSPECTION TYPE-N/A, DURING DEPARTURE CLIMB PRIOR TO FLAP RETRACTION, THE NR 3 THROTTLE SNAPPED BACK TO IDLE WITH AN AMBER TR WARNING LIGHT ILLUMINATED. NOW ACTUAL AIRFRAME VIBRATION NOTED. THROTTLE WOULD NOT ADVANCE, ENG WAS THEN SHUTDOWN. AIR TURNBACK TO SDF. FOUND CONDENSATION IN ANNUNCIATOR RELAY. REPLACED RELAY SYSTEM, OPS CHK GOOD PER 78-30-00. ADJUSTED AND TESTED.