Although I support your efforts to obtain a Mk2, I think you should also look into getting the Mk1 fixed. I'm sure that if you contacted support, they could help you diagnose the problem and either repair it for a reasonable fee or give you information on how to repair it yourself.

But whatever you do, definitely get a Mk2 anyway since it's such a great piece of work and has some great improvements over the Mk1.

You could also sell the malfunctioning Mk1 to someone who'd like to get it repaired.