There are 2 drain plugs on my pump. One is in the front and one is behind the case assembly. We can't get to the one behind the case assembly and that is the one that is leaking like a sieve. How do we get to that short for taking the pump and filter off of the base. If that is the case, how do we take this off the base. I need to get this running or else I need to get a new system so any help would be much appreciated.