Enlarging drain holes and top not moving issues

Hello everybody,
I am trying to see if enlarging the drain holes on my 2005 z4 future proof the clog issue.

I relocated and changed the pump for the top and was working for few months but now just the fluid oozes out from line 13/11.. the piston or ram whatever it is called that 13 comes out of has oil all over it and the piston which has 11 is rusty. Is there a way to inject voltage to see which is the issue?

I am a newbie and have not worked on cars before. Right now the soft top is completely out and so are the plastic pieces for the water collection.
 
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