What was found
(CAN) WHEN INSTALLING THE SERVO THE ENGINEER NOTICED IT WAS IMPOSSIBLE TO INSTALL THE LOWER ROD BEARING AS THERE WERE NO THREADS IN THE PISTON. THE SERVO WAS AN O/H UNIT. THE SERVO WAS SENT TO ANOTHER O/H SHOP FOR REPAIR AND IT WAS NOTICED THAT THE PISTON WAS INSTALLED UPSIDE DOWN. THE SERVO WAS REPAIRED AND RETURNED IN SERVICEABLE CONDITION.