Leak report: Post your winterizing failures here
So, you thought you got everything. You were sure that the freshwater system was either drained or filled with antifreeze. You dumped the tanks, drained the water heater, put antifreeze in the traps, drank up all the soda pop and beer, and even remembered to take that jar of mushrooms inside.
Post the leaks and other failures you found this spring so that others can learn. If relevant, indicate your method of winterization last fall -- compressed air, antifreeze, gravity drain, etc.
I'll go first. I'm replacing a cracked toilet valve despite blowing the lines thoroughly with compressed air.
To learn to see below the surface, you must adjust your altitude