I got the undertray off this morning, bumper and fender are next.
I found that one of the lines slipped off of one of the socketless aeroquip connectors, and the other one is back a little bit. I don't understand how that could happen, as when I made the kit, I had cut a hose a little too short, and could not pull the connector out. The only way to get it out was to cut the hose. Anyway, I guess I will be getting some hose clamps today and double sealing them.
I guess I can take some small comfort in the fact that I went off before the engine had a chance to blow, and that it wasn't something stupid like not tightening the oil filter or reconnecting the fittings to the sandwich plate properly last oil change, which is what I feared.