When I had the problem, there was nothing to repair. I had an external ballast with cords that were not labeled the same as the connections on the fixture. I do not trust myself with wiring. Marc (works with me at TFW) could check it out for you if you brought it by the store either this Saturday or two Sundays from now. However, TFW has no availability to order parts for oddysea, so if it turns out to be a ballast issue, there is nothing we can do.