Well... I don't actually know any gundocs in Vancouver who work on spring powered guns, not only that, I know they don't like working on clones so I guess you're kind of SOL unless a gundoc actually does take the work and even then I don't think it's worth it because it was a cheap clone to begin with. It's like buying a TV for $500 and it's $1000 to repair it just get a new one.
Gun docs who you can trust in Canada (not inclusive of every single one in Canada):
http://www.airsoftcanada.com/showthread.php?t=72809