I can't speak to do-it-yourself work, but if you decide to send it to a shop, I've had Flutot's Camera Repair (http://flutotscamerarepair.com/) do work on my Mamiya TLR shutters and they have done a good job.
Strongly ===> What he said!
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.