We have a New Holland Td80d and the shuttle shifter is having a hard time going in forward and when it goes in forward as soon as there is no drive pressure it pops out to the neutral position.. if you hold mild hand pressure against it it’ll stay but as soon as you let go pops out .. no problem with reverse.. The story we’re hearing from the young hands our nephews is that it was forced into forward as it rolled backwards down a hill do to brake failure.. Is this a bent shifting fork and if so do we have to split the tractor to fix ?? Thanks in advance for any help …