What was found
AC HAD A STRANGE VIBRATION AND A SQUEALING SOUND. AFTER TROUBLESHOOTING WHERE THIS VIBRATION AND SOUND WAS COMING FROM, THE MECHANIC NOTICED ONE OF THE SERVO’S VIBRATING A LITTLE BIT AND PUT HIS HAND ON IT AND THE SOUND STOPPED. SERVO WAS CHANGED AND THE SYSTEM WENT BACK TO NORMAL. SERVO’S ARE AN (ON CONDITION) ITEM A CLOSE LOOK AT THE PILOT VALVES FOR EXCESSIVE PLAY IN THE LINKAGE ASSY ON THE SERVOS DURING INSPECTION INTERVALS. (K)