Update: Did some work on Mrs. NoWhammies bike last night.
- Tightened the head tube to spec (5 nN)
- Took a look at the skewers, both front and back, cleaned, reinstalled, and tightened the wheel back on
- Clean and lubed the drive train
And...
Took a look at the seat/seat post. Here is where I realized the seat post clamp is shot. The clamp doesn't tighten anymore. How Mrs. NoWhammies was able to ride the bike without the seat post shooting straight to the bottom of the seat tube I have no idea. Anyway, I'll pick up a clamp after work tonight and see if that fixes things.
So I wasn't able to ride the bike and see if I managed to get rid of the creaking.
Also...
When I put the rear wheel back on the bike and was running through the gears (after cleaning) the chain was NOT staying in the largest cog on the back. Once again the chain would run on the largest ring for a bit then jump down to the second largest ring for a bit, before jumping back up and repeating the process. Another mystery to solve...