Backstory is that our house was built in 1974 and was built with aluminum wiring. When we bought the house it had a new 200 w box installed. That was 27 years ago. We had an outlet fail and a supposed electrician came in and showed us that it was backstabbed and that was not right and 'fixed' it. Another electrical company gave us a telephone quote only.
Yesterday a Master Electrician came in to give us an estimate. He pulled the cover off the junction area that had been used to connect the new box and one of the connectors was burned through and another was brown. He pulled the outlet that had been 'fixed' and just moving it caused the circuit to blow. (I know enough about electricity to know that was not right!) He checked several other things and gave us an estimate for replacing outlets and switches, fixing the junction box, tightening up the box, etc.
Needless to say, we hired him.
He mentioned that the central box should be replaced every 20 years. Is this a sales recommendation or something that is essentially necessary? It seems a little extreme to me, that an electrical box should only last that long.