Nobody that I know of in Michigan...
You might try
http://www.dyersblowers.com/
They're up in Chicago.
Could also try Oddy's in New York.
http://www.oddysracingengines.com/oddy_contact_us.html
Otherwise, probably the best place to send it would be RBS Superchrgers in Cali.
http://rbssuperchargers.com/
If it's run improperly, assuming the rotors didn't touch the case, the rotors are more than likely junk. Have any photos?