One good thing about the high end audio industry is that the owner of the company usually has a personal relationship with his customers. When they go out of business they don't like leaving the customers "up the creek without a paddle."
Start with the companys original address and work your way back to the names of the people involved. Sometimes the person who was actully performing the repairs sets up a little business of his own a la Geroge Kaye of Moscode. The company may have an inventory of spare parts that was overlooked by the creditors.
Periodicaly the companys often rise like Phoenix from the ashes.