I was out mowing and got in to a wet area and i have to go in to FWD. I also tried to raise the deck and it was barely moving. The valve knob is open and i verified that. I brought it in to the garage and the 3pt wont lift anymore. The fluid level appears adequate. I am currently at 1000 hours and i need to change the filters and fluid. any thoughts on what would cause this/solution? will changing the fluid and transmission/hydraulic fluid fix it?