Has anyone been having any problems of leaking hyd oil from upper left side. Looks to be coming from the range selector H N L that goes into transmission. Leaks down and under hydro case. Tried tighting hydro fittings that go into transmission and all seem tight. I appears Deere used some type of silicone gasket on this tractor that isnt holding up. I've replaced both front hub seals over the past couple years for they were leaking oil out the front differential. Any recalls on this issue??