Well, I know that I mentioned earlier today that "rust never sleeps", but perhaps I should admit that it's 13 years now since I last had a go at an x-ray set in anger, as it were! So, I could well be a bit rusty here, as you can probably tell.
However, and having said that, I would say off the top of my head that the results you mention would give cause for encouragement, if I were there doing the job myself (and without any information to the contrary).
There is "something there" (which is always nice), and the voltages boost during exposure, which is what you might have hoped for. An indication saying "Filament supply error" when the filaments are disconnected sounds good, too, I would have thought.
OK, so the filaments themselves are OK. And it looks like there's something coming out of the filament supply. Voltages, at least (but I wonder whether a loss of current is being hinted at by the error message ... there's no sign of any insulation breakdown anywhere, I suppose). All good news, then, on the face of it.
So, I think you need to go back and try to establish where the "Filament power supply" error (?) message you mentioned earlier is likely to be generated from. That is, what triggers it? An attempt at too much current being drawn (and indicative of a "short" somewhere)?
Have you got the filament power supply open? Have you had a good look at it (fuses, obvious signs of distress, unwelcome smells, and that sort of thing)? What's it like? The (old-fashioned) transformer based type, or some new fangled arrangement? Is the transformer looking good?
And ... are the (mA) settings in the realms of the real world? Can they be varied? Or have they become "stuck up" in some way? Or, perhaps mA is fixed on this mammo unit (and just switched at broad and fine focus ... why both on a mammo, I wonder)?
