Two places that claim repair, Lextech Lighting Systems and Mikado Technology/Sammy WU (referred to by Lexus Dealer). Lextech can repair and change color schemes, Sammy just repairs. Both have e-mail contacts.
I'm a recent owner of an SC400 with the same problems with the instrument cluster. A Lexus dealer informed me of http://www.mikadotechnology.com/ that rebuilds clusters. Am waiting to hear. Plus still interested in LLS. Anything else I need to know about the car?