JD3800 Electrical problem

[Dman2]

Our JD3800 has started blowing the transmission control fuse when using the joystick
Anyone else had this problem

F20​

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20 A, Transmission Control Unit (TCU), FNR Lever​

 

[Dman2]

Funny thing is, you can still go forwards or backwards
Unless you stop and restart engine, then will not move