Well, first you have to find out what the problem is, and then you have to fix it. Not easy if you're the kind of person whose tool kit contains only the plumber's phone number and a credit card. But there are no plumbers (electricians, mechanics, or carpenters) at sea, so you're stuck with you. And you either have lots of experience or are going to go through a lot of trial and error. Since the hit-and-miss method usually entails more missing than hitting, and honestly, you're not all that experienced, let us give you the benefit of our combined centuries on the water.