Re: EF3000iSEB Quite putting out electricity

I just ordered a service manual at my local Yamaha shop for $40.  I made a mistake on it was the power unit also known as a DC-DC converter, for the boost that has 2 wires hooked to the battery.  The positive wire was hooked to the ground on the battery and the ground was hooked to the positive on the battery.  It did blow the fuse on the power unit.  I replaced the fuse.  I think this may have destroyed the control unit though.  I can buy a brand new generator just like this one for $1,999.  I would like to fix this one if feasable.  If I have to order both the power unit and the control unit it looks like it will cost me more than a new generator.  Where can I find these units resonalbly priced?

Thanks