Are multiport valve has been limping along the last couple of years it was a little finicky about exactly where it wanted to be without leaking but this year I'm afraid it's a total loss. As you can see in the picture one of the little metal prongs that keeps it in place is now missing and the only settings it seems to not leak in are filter and rinse. So I'm not sure what parts exactly we need to replace and how to decide what to replace it with as we've never had to replace one before. Please help the pool dummies.