I spoke with Epson tech support. The error code was interpreted as a "hardware problem." The operator was cordial, professional, and patient with my several questions.
Because the printer is still under warranty, they are sending (via FEDEX for delivery tomorrow) a refurbished unit with a new set of initialization ink cartridges (i.e., the same cartridges that are packed with a new printer). I will have to return the non-functioning printer.
When I asked about salvaging the cartridges that are in my current printer, I was told I could remove them and, if they are "safely stored" (e.g. each in its own ziplock bag along with my other new, still-boxed backup cartridges in the drawer where I keep the cartridges), install them one by one when the corresponding initialization cartridges need to be replaced. Any thoughts on this? I'd rather lose those partly-used cartridges than risk another problem with my soon-to-arrive replacement.