wrote in message

stuff snipped

If they have been there for 40 years without a problem DON'T TOUCH
THEM.

I'd still inspect them, especially in an older home. One of the hot feeders
from the meter had corroded after about 40 years. Thermal contraction and
expansion, mechanical vibration and condensation all take their toll. Not
sure what caused the initial probem - circuit box mounted on inside
cinderblock wall of unheated basement area so I suspect condensation.

Once an AL connection starts arcing the process proceeds much more quickly
than it does with CU wire, AFAIK. But K sometimes means "knew" and not
"know." (-:

Is/was your installation pure AL or copper-clad?

--
Bobby G.