The service man just left. The exhaust chamber on the boiler was full of soot... just about plugged solid. He also found not one, but
two squirrels roasted well-done at the bottom of the chimney!

Told the wife to forget the turkey and ham for tomorrow...

All in all, everything turned out well thankfully.
I ran out this morning and bought 3 new combination smoke/CO detectors just to be safe. I still can't believe the one we had didn't go off as there was a really strong odor of boiler exhaust throughout the entire house. Luckily nobody is showing any signs of anything (other than being cold).
Lot's of stuff to do today before heading to my mom's for the Christmas Eve feast. All I know is that there's stuffed shrimp, scallops, and lobster tails with my name on them!