BC 21 upgrades - anyone?

Friends, my trusty Blue Circle 21 has fallen on hard times. Some sort of electrical gremlin prevents it from firing up. I suspect I will have to send it back for their attention. I was considering the possibilty of upgrades. The basic tweak is $1000 and full boat is north of $2000. Is this typical for an upgrade? Even the lesser work equals pretty much what I paid for it new. Anyone here had either version done? Tx. David