I have a Pentair Sta-rite Dyna Pro pool pump (MPRA6E-205L) and it has started leaking a bit below the seal plate (5), so I ordered a replacement o ring for it (6) and the front of the diverter (10).Put it all back together and it is still leaking out of what appears to be the back side of the seal plate. What else can I replace that could be causing the leak? TIA