I'd recommend you get an isolation tester device and an instruction on how to use it by a local electrician. That way you can (relatively) easily check your house installation - not just devices but also the home's wiring itself - against danger due to insulations going bad, before someone gets hurt or devices start tripping the GFCI.

Speaking of GFCI, I seriously hope you and everyone else reading this thread has all their wiring protected by one. If not, please please please get it retrofitted ASAP, and if you can afford it, retrofit a combination of thermal fuse, GFCI and arc fire detector. Electrical issues are a leading cause for domestic fires.

> Guess: "Gas Seals" was a checklist item for that last service man at church. I think we have our gas stove, water heater, and furnace looked at every 7-ish years by someone from the local gas company.

Good, then you should be good to go (and it's crazy that the pipes, fittings and interior seals are still intact at that age and not dried out!), although 7 years is quite the stretch. Here in Germany, the norm is once a year for furnaces/water heaters - personally I had an emergency repair to be done as in well below a year the water heater went from "perfect emissions" to "dangerous CO levels". The cause turned out to be cat fur being sucked in and burning up, depositing soot on the burners.