2014 XR4040H 900h. Regens every 4 hours. 2-3 cycles ago the Regen cycle lasted 2 hours then back to normal. Now the Regen won't turn off. I was Regen and running the tractor at 2000rpm. Now if I Regen at 2k RPM the warning lamp comes on and the Regen cycle stops mid process. If I keep the RPM...