Rtv 900 transmission won't move

Kubota dealer labour rate $189.00 hr. Here, and I am not schooled on hydrostatic transmissions. Would like if anyone would have any ideas on parts and labour
 
What year? Simple things first. Change oil in the transmission and hydraulic tank with sudt. Change both filters with oem kubota filters. Find the link to the operator manual and read it. Stoopid question??? Is it in gear? Does it grind when trying to slip it in gear at half throttle? Check the releif poppet .
 
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