I have a RZT 50 that is 8 years old and the right side seems to be getting weak especially when in a hard cut. This seems to get worse as the mower heats up. After a half hour or so in a hart cut it will almost stop. I have been cutting about 3 to 4 acres here and not sure how much I need to put into an 8 year old mower. I just replaced the deck and wouldn't you know now the transmission on the right seems to be failing. My question is what should I check that might be my problem before I jump into a very expensive repair. Thanks for any help.