@erik_squires And I forgot to second how good your advice is to replace the FPE breakers. One neighbor did thermography and had half a dozen hot spots. Hot spots can runaway like a redplated tube. Heat raises the resistance which makes more heat and reduces voltage and some appliances want to pull more current and next thing you know you have a fire.
I replaced them before I knew how bad they are since I was rewiring the garage and didn't have room in my 100amp box. FPE breakers were then available at home deepot "rebuilt" for about 3x the price of new quality breakers. I assume that you can still buy them. but you shouldn't. bite the bullet and put in a new service box.
Jerry