I own the 938's and have had to deal with Hyperion cust service on a couple of occasions. FWIW I bought my speakers used, so the speakers were not under any warranty. The service may be a tad slow, but I can say that 1) As far as I know, they are still in business, and 2) I did get friendly, helpful email help from somebody named Derek, and ultimately all my issues were resolved.
They do still have replacement parts for the 938's as well.
They do still have replacement parts for the 938's as well.