The springs all look good. The head is only 36K mi old?
If some how there is a failure in the oil getting back there... I could see maybe a valve sticking in a roached guide... I guess.
No matter what, the head has to come off. The best thing I can think is to try and talk my friend into sticking it in her barn until I can find some money. I don't even know how I would get it out there. I can't work on it here.