The above image is from our initial inspection. Notice the big red pointy arrow? Our AC condensation drain was too close to the house and could (after hundreds of years) start eroding the foundation.
It's one of those things that shows up in an inspection that doesn't need to be fixed right away (actual quote from inspector), but it's an easy fix so I thought I'd give it a go. A bit of tubing and a little bit of sawing and the drain is the suggested 5 feet away from the house (5.5 feet actually).
We're lucky enough that right in front of the drain is a bit of a rock garden - the transition from the back patio to the grass. So I didn't have to do any digging; I simply pushed some rocks away and then pushed them back over the pipe.
One more thing off the list.