Five minutes after posting this complaint I got a note from Elliot saying he was sending my amp today and provided a tracking number. I've edited out the details and will report back on repair after I receive it.
I also had a failing Promedia Ultra 5.1 sub and based on recommendations in this message board contracted with elliot-tronics to get repair/upgrade. For whatever reason, I had trouble getting him to complete the repair and return the amp and he was intermittent at best with communications. After a couple of missed commitments, he shipped it back to me 7 weeks after he received it. If he has issues (lack of parts, lack of time) with repairs, he needs to give better estimates and then let customers know when there will be delays.