Im thinking of opening up my 12a to take alook inside and see if i can see maybe a broken seal or something. I read that u can remove the one way cheak valve from a normal compression tester and use it for the rotary so ill do that then if its low ill open the motor up and look. My ? is do i need to replace any seals from the front part of the motor and rear because im just planing to take those off not the housing where the rotors actually sit in or can i just remove look and reinstall? thanks