If you remove the PTO solenoid I believe it pushes on a spool to deactivate and pulls back to activate the PTO. Its common for that little spool to get stuck in either direction. I've had it happen twice on my 4600. Just have to remove and clean or just exercise it a bit.
Hi 110TLB, i've owned a 2007 model since new. Check for a stuck direction pedal. If they don't return fully you'll get an error.
You can lubricate the bushings to get it working smooth again.
Check your Creeper direction switch that it isn't stuck down. Common to get stuck with dirt...