Hi, i have a 2018 Exmark lazer z with 350hrs. Today the hydro belt broke one me. I noticed the right side hydro was a milky color. I asssume water got in? I think it got in because the cap is screwed up. A few times when i turned to tighten, the threads didnt seat the right way. I had to back it out and turn in all the way. Anyway i may need a new hydro cap too. Not sure if i want to take to dealer or do myself. Im not sure about the contaminated hydro. Can i just drain and refill? The left side hydro oil looked good. So im assuming i can just change the oil filter and add to fill, correct?