That's great information... thank you!
The car had been sitting in storage until last Friday (Black Friday), when I was able to do a little more troubleshooting. I pulled the firewall with intent to pull the belt, but I didn't have a big enough socket with me for the tensioner... otherwise, everything looked good there (from what I could see with the belt still on).
I also pulled the carpet and foam from the trunk, and the was a small amount of moisture present. I don't have tools to pressure test, so I'm not sure if the moisture came from a bad cap, the original overheat (boiled out), or a crack in the reservoir.
I did notice that the reservoir was empty again, so I plan to pick up more distilled water and take it for a test drive to troubleshoot further. I'll be sure to report back with my findings!