I have a Toro Titan zero turn Z6050 model 74824. It has about 31 hours on it. During the summer it started leaking hydraulic fluid. I filled it and it would last a month or so. It got me thru the summer. It sat a month or so and when I filled it to move it to repair it it moved but the left transmission would not work. I figured it needed bleeding because it was almost empty. I replaced both pump and gears which was leaking. Changed both filters and put new fluid. Bled it according to the procedure in the manual. The left transmission is still not responding fully. I re-bled it again and it works a little better. Any ideas?