OK- here's another follow-up. After multiple calls to Dennis Megarry (who
always seemed like a nice guy, very personable, etc) with no response, as
well as sending emails to Irex with again no response, I just received an
email from Arinc, who apparently instructed Dennis to send me a new
replacement unit, even though the screens are generally not covered by
warranty. According to prior conversations with Dennis, up to 20% of the
units arriving from Irex were defective and needed return.

I hope that the unit will arrive shortly, and will post if and when it does.
However, obviously Arinc, MyAirplane.com, and Irex should mutually determine
a warranty policy since they are a joint venture.