Oschner is the USA importer of Assos. I would contact them as they might have designated repair companies. In general, NEVER apply heat to any synthetic (lycra, supplex, etc.) without knowing what you are doing.

http://www.ochsnerusa.com/index2.html

I remember seeing somewhere that Hidden Bay Imports in Wisconsin was an Assos repair shop but I don't know where I saw that or if it is still the case.