jsantos,
If you want to check it yourself, start by opening the v-drive cover to get to the pump manifold. Turn your front ballast switch on and see if the pump is running. If it is, it's probably the solenoid if the system is primed and the other bags are filling just fine. From there just flip the little black switch on the solenoid for the front bag. If you get water to the front then, I'd say it has to be the solenoid or wiring. You can use that method to fill the front bag until you get the problem taken care of. Just be aware that you need to flip the solenoid switch back when you're done filling it or running the pump to fill any of bags will also fill the front. The front bag may also slowly fill while you're running at speed. If the pump doesn't run while you're trying to fill the front bag you can still flip the solenoid switch while running the rear bags to get it to fill until the dealer gets it taken care of.