If so with the price of the inverter board we'll want to make sure that you can return it if it's not the problem. Also this site is always more expensive.
Probably the inverter, the power supply is always the weak spot. I would make sure that they have a return policy wherever you get it though in case I'm, uhh, wrong.
It would probably be a 10-20% fee but it beats eating the whole cost at that price.
I would pull it apart and see what the board looks like first. I don't think I have any manuals for the aluminum models, I'll see what I can find unless you come up with one first.