when you get it run some air through it, and find out exactly where the problem is, and post it up on here; there are a lot of people who own timmies who'll help
is there a factory reset option on the board, is there a chance he's messed with the settings & buggered it up that way?
Otherwise go through the marker and strip it, and replace any broken o-rings, and lube & clean it all to start with; then go from there.