Hoping someone on here can help with this strange problem.

My box is fine when cold but as soon as it's warm it and you leave it in 5th for a while it jams in there and is very difficult to get out and across the gate. Once across though it's fine until you leave it in gear for a bit then it jams up again.

I've shielded the gear selector from heat and changed the oil to no avail. Thought it could be the selector forks but it's fine engaging gear and when cold. Did see mention of a collapsed pin in the selector mechanism on top of the box but no details.

Has anyone had this before I'm hoping it's not a new box as this one has only 19k on it.