It is not a hard item to replace. Price is around $50.00 or so for the part. Or get a can of penetrating oil like PB Blaster, Kroil or similar, pull the vent line off of the valve and spray some into the valve. Then tap the valve a few times and it should retract.
Or possibly check with a dealer, they might be willing to deal a bit, that part was covered up to 50,000 miles I believe. Nothing to lose.
Picture is what it looks like.
Image (Click to make bigger)
Monday, July 17th, 2017 AT 1:05 PM