As I was going through the "Appliances" file (which appears to have receipts for furniture and guitars in it, as well as anything that might be categorized as an "appliance"), I found a folder from Lowe's from when we had the new water heater put in. That would be the water heater that has the annoying intermittent failure on the upper tank sensor that I have been fixing by the laying on of hands method.
Apparently, I bought an 11 year extended warranty.
Well, I guess I know who to call when it fails next...