Regardless of what is causing the problems internally on the Laserwave 640's, I would think it is not up the the buyer to have to solve the issues.
Word on the street is the Laserwave 640nm's are approaching 100% failure rate.
Personally, I won't be buying any any more chinese lasers. I'll spend the extra money and get a Kvant. Or possibly other companies like Ultra Lasers.
Thanks again to gottaluvlasers (CT Lasers) for standing behind the customer and not the supplier.