I'm trying to diagnose a leak in my center ballast tank and am trying to determine what the 3 hoses on the tank are for.
- 1 at the bottom rear of the tank is the fill/drain line, I assume
- 1 at the top rear of the tank: overflow?
- 1 at the top front of the tank: overflow?

If one of those is for overflow, what is the 3rd one for?