JD 210C only forward, no reverse.

Hey guys, got a bit of an issue with my Loader Backhoe, JD210C. I was loading some gravel and noticed I had reduced forward power. I tried reverse, and it was strong, and still is.

It took more and more rpm to get forward, until there was nothing. Now I have reverse, but no forward.

I think it is the reverser control valve, or the solenoid that is on the valve.
There is ample oil in the sump.

Any tips to try and diagnose and repair this? Hopefully this is a rather simple fix, and not something that I have to crack the drive train in two.

Thanks.