looks to me like there may be a moisture problem, also.
You got that right. Id like to see anybody here go buy a washing machine, or a car, or a lawn mover that lasts 35 years. Everything made now days is cheap crap. This older stuff served its purpose. Nothing lasts forever, everything has an expiration date.35 years ain't bad.
I don't believe that for one minute. Receptacles and switches in rental properties see some SERIOUS use. Tenants in and out, stuff plugged in all over the place, space heaters, maintenance men, fist fights, drunken idiots...I don't know what sees more action, a rental property, or a cheap whore.Bah. Done right there's no reason it shouldn't have lasted for 70 years. It doesn't do anything but sit there.
What I see there doesn't look like the result of device failure to me. I could be wrong, but it looks like conductor faults. No good reason for that to happen.I don't believe that for one minute. Receptacles and switches in rental properties see some SERIOUS use....