I've never had to change one yet but they do sell them so I guess they are replaceable.
There was a guy on here a year or 2 ago with a similar issue like you have. The dealer found that his front mounting bolts were not tight on the transmission and it was causing the issue. Probably not your problem but just throwing that out there.
Does it sound like you are having pump cavitation when it is surging?
I run Rotella 15w40 oil and Wix 51410 filters in my hydro transmissions. For what it cost, I would drain what you have in there, save it and install a new Wix filter and Rotella just to rule that out.
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