If there is a concern that the yeast may be on the diaphragm, why not
simply toss it, and get a new diaphragm? This seems like the simplest
solution, and then you can start using it, and if the yeast problem is
still present, then you at least know that the old diaphragm possibly
harboring yeast is not the problem.You may still have a yeast prob., but
at least you can focus on other sources, and not the diaphragm
anymore.(talk about redundancy!)

Ellen