Thank you for the response, fast. The lack of negative responses so far has been encouraging.
I agree with the notion that Krell's customer service has been strong, minus the repeat failures of this particular unit. But all the same, I'd prefer that I didn't have so much experience in this area!
In the interest of staying within the normal chain of command, I'll forgo calling Mr. Schofield at this time. Although his reputation suggests that he's very approachable and helpful, and that speaks volumes to the reputation of the company as a whole.
The dealer I purchased the amp from is working with a Krell rep to try and get some relief from the shipping charges required to send the unit to them (Krell pays the charges to send it back to the owner). That will be most welcome given that I'll end up paying what a lesser amp costs just to have this one fixed repeatedly.
Time will tell, but I'm hopeful.