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.