Followup- I cancelled out the code check with the dealer. I'm playing my hand. Stabilitrac system has been behaving for 5 days now. The only thing different is that the rain has stopped and all is cold and dry. Now I'm thinking that moisture may have got into one or more of my ABS hub connections. This would explain why I was getting Trac and Anti-lock warning lights for a few days while very wet out (after replacing both front hubs), but it does not explain why I no longer get the Stability Control System warning on the DIC.
Heck I was getting that light several times per day, and it was getting worse by the week, until 5 days ago when the Trac and Anti-Lock lights started behaving themselves. As you may recall the Stability Control System warning light began shortly after lubing the intermediate shaft about a year ago. Funny thing, I relubed it a few days before the Stabilitrac system self-corrected! BTW, I lubed the shaft by coating the shaft "universal" with spray lithium grease as someone here suggested. It took a couple of days but the grease must have worked in somehow and all is very quiet and smooth "for now".
Tomorrow I'm going to have a look at those ABS hub connections to see if I can figure out why I might be getting moisture in there.