Have you tried dropping Krell a line? They may well have service arrangements, and will certainly be able to interpret the error code which will inform whoever takes it on where to start.
@Jazid The UK contact for Krell is Absolute Sounds and having dealt with them in the past service costs are made up in their head then increased by fifty percent just make sure you feel really cheated . Krell will almost certainly suggest that the OP contact them while I would advise him to run away as fast as he can . It may well in the end be the only option but try other options first . I would though agree that sending an e-mail of the issue and asking them if they could say what the issue is as armed with this any service engineer then had a path to follow .
