It pretty much took all week [1].
Well, at least until Thursday o'dark-thirty.
From what we can tell, there was a lightning strike at or near the customer site, which took out all four of their T1s (two data, which terminate at our Data Center, and two voice, which I suppose terminate somewhere within the bowels of The Monopolistic Phone Company). The Monopolistic Phone Company did eventually come out and replace all four smart jacks at the customer location (as well as the container box). Then I spent a few days playing Musical Equipment trying to get everything back up and running (let's see, we replaced nearly all the cables, one CSU/DSU (Channel Service Unit/Data Service Unit), a router and a firewall).
It was a very frustrating week, let me tell you.
Lessons learned this time:
I then called in sick yesterday and spent the entire day sleeping.