Mahindra 4500 3 point lift will not go down

[Starliter]

While operating in the field the 3 point lift worked fine. But when I got to the barn, the lift would not go down. The loader workds fine to all positions. I verified draft control lever was not up, verified the draft control sensor pin was not stuck inside the housing. I have not tried moving the isolating valve under the seat but it has not been moved at all.