Originally posted by JeffJS Maybe you need to mark the photos up with red arrows and circles showing what you're concerned about.
I have the feeling this sort of response is a typical first answer from most service departments (blame the user).
Yes and no. I think its only reasonable to expect original, unedited output for diagnostics. I'm surprised why would you send only edited ones. Actually i bet they'd be a lot happier to get RAW files. You can supply additional edited versions of the files where you point out the problem and make it easier to notice.
But telling that they cant see the bands makes me think you'll have hard time with them. I can clearly see them on my uncalibrated, cheap, discolored LCD. Whenever i've had any warranty issues only few times it has gone the way it should be (within reasonable time-frame, cost free, without the need to argue and repeatedly being redirected between several places).