Thanks for the tip. I did try tweeting @Ford again yesterday but still no reply.
Yes, there was a coolant leak into the lower battery pack, they said. Although the TSB you mention, I did have that problem before with the SSN light but they only replaced the cable and never the battery. (They did this 3 times before it finally stopped.) That was about a year and a half ago. This time, I got the wrench light which indicated take in for service ASAP. It wouldn't go off, just stayed on. No SSN light. That's when they said the battery leaked and replaced it.