I ran into this issue while doing grapple work, It chimed at me and started flashing E-95 across the screen. I looked up the code which told me the PTO solenoid was in trouble. So I looked around and couldn't find any solid information, so I decided to make this post for the record so anyone who searches this error knows exactly where to go to find the PTO Solenoid relief valve sensor. In my case a small branch got in there and pulled the wire from the fitting. Here is its location shown in the picture just behind and to the left of your hydraulic oil filter. All tractor functions are intact but the PTO, since I was not using it I was able to continue working until I can rewire the fitting. Hope this helps someone.
Regards,
JKW
Regards,
JKW