ballast empty problem

I have a 2002 super air 210 and the starboard tank won't empty. Does anybody know if it has separate pumps to empty each side, or if one does both sides? Also I think the pump(s) is/are located beneath the engine, but I am not sure, can anyone confirm or deny this?

They are on the bottom port side of the boat beside the engine. They are not hard to get to. Once you take the carpeted boards over your hard tanks you can see them. I had to replace both of my pumps last week. Check the tank to see if the gauge is messed up. I had a gague that said it was full but it was empty. I replaced the sending unit. I had these problems becasue didnt witnerize the ballast system.

Thanks, I will try to fix it soon because spring is coming!