Ok. The CIS guys sent me another cryptic email today instructing me to call them. No information about what, just "Hi, please call customer service". A little odd, but OK. I called them, and they seemed surprised I was calling, but they did clear up that the package being sent was a full set of replacement ink.
While I had their ear, I asked about the print head issue. Their technical guy ended up calling me back and had me walk him through what I've experienced. He seems to think it's probably *not* the print head, but possibly an ink flow issue. He gave me some simple things to try out tonight, so when I get home from work, I'll lay down some paper towels and see if the cyan cartridge has just run dry, or if it's clogged.
I will say that it's a good sign that they had someone knowledgeable call back with what sounded like totally valid ideas about what's going on. That *isn't* the kind of support you get from big companies. I'm staying cautiously optimistic about the process.
UPDATE: I got home and tried his suggestions. I am at a loss for what is going on. I mean, it LOOKS like the cyan (and yellow) cartridges were not filled very much, which was a guess he had. His suggestion was to use the provided tools to "purge" the cartridge - draw ink through it to fill it up. I did that, but it hasn't helped the problem any. I will have to try to email him and see if I can walk through things on the phone with him.