Apart from the pretty strong clue that you've already furnished there,
Djiela what else is going on?
That is, what are the results like? Does it actually expose? Are the radiographs a bit on the light (or transparent) side ... indicating low filament current?
If the message actually mentions the filament power supply, that sounds like "good news", as (hopefully) the fault will be in the filament supply, rather than in the tube itself. But, having said that, filaments usually just go open-circuit, resulting in no exposure at all.
So, low filament current is suspected, but more clues are required!
