Only the 89+ has LEDs. Unless he put them in there himself, in which case I would hope he could figure out how to fix them.
You should just be able to take the wing off, pull off the lense (screws or whatever, I don't have one), see why they aren't working. Could be a bad connection/solder or bad LED. Either way you can solder a in new LED using a soldering iron and new solder.