You will have a hard time finding anyone to fix the ballast. If you were to open it up and look inside, you will see that everything is coated in a thick layer of black rubberized something-or-other. It's probably more cost effective to buy a new one. Sorry man, wish I had some good news
J+L has a good deal on them usually, Good luck!
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90 gal SPS display+65 gallon mixed reef
GEAR: Korallin calcium reactor, bio pellets, digital aquatics controller, Tunze ATO, MP40, 4 x Tunze 6105 w/controller, Reef Octopus Xp3000 ext, 2x250w MH, Futura LED.