Trying to help my dad out who is 400 miles away and doesn't belong to the forum. He called tonight stating his pump is leaking from the rear of the pump near a mounting plate. The leak is a drip at this point while running. Trying to figure out if this is an o ring issue and if so, is it possible to replace without having to take the pump completely off. If not, is there a way for one to do this at home? Any help or link i could pass on would be appreciated. Thanks