Good luck with that! It sucks that such an expensive thing is giving such problems.

I just bought a Dolphin Diagnostic and it works pretty well. (Doesnt go as high on the walls as I'd like, but that can be adjusted from what I understand.)

I do, however, remember reading somthing in my manual about PH levels. (Not that your levels are unacceptable. Im sure 7.2-7.5 cant really matter that much, and they certainly arent treating you like a good customer. Good luck!