I have a 2011 M7040 4wd, my problem is that the 4wd stays engaged, I got under the tractor and physically took it out of 4wd, the light went off and all worked fine in 2wd. I was able to put it in and out of 4wd, but now it's back to staying in 4wd, I can pull up and down on the lever, but stays...