rzt 50 kawasaki motor parts

My hydrostatic transmissions are slipping and seem to be sealed units no filter or way to drain the fluid
Can it be fixed if replaced can I use a model that has a filter and fluid drain
Does anybody have one new or used in decent shape
 
I have a Cub RTZ zero turn with steering wheel. My question how can I eliminate the computer that controls the start and deck blade and replace with a simple start stwich and deck control stwich>
 
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