Update: I got my car back today (it was really ready at the end of yesterday, but I couldn't get over there then). The part that was ordered and replaced was:
MDL S, DM, THERM SYS, ELEC BATT HEATER(1038901-00-K)
Out of pocket would have about $700, but I only paid the extended service agreement deductable of $200. Everything seems good now.
Communication with the service advisor was all by SMS, but he was quite responsive to a couple of messages I sent. They even charged my car before I picked it up. Overall a very satisfactory service experience.
Bruce.