I have 2006 YTH2448 and the last time I mowed it suddenly had a problem making a small incline. Then the forward speed dropped to almost nothing and I shifted to reverse. It also had problems. After a while of trying to go back and forth it finally just stopped. I was told to check the fluid level. I was told it would be under the seat, however that wasn't the case. How and where is the fluid level check on this particular model. Any help is greatly appreciated, thanks.