FPE breakers, in the opinion of many, are to be avoided at all costs. They should be pounded into dust, preferably using a very large hammer (power off, of course).

I always recommend replacement of the entire panelboard when I run across this brand. Besides, the premium price that you will pay for a couple of breakers, especially 2 pole, will almost buy a new 100 amp panel. I can imagine what you'll pay for a GFI breaker for one of these panels.

Jerk the panel out, junk it and we'll all sleep better knowing that another one has bit the dust.

Tom

Few things are harder to put up with than the annoyance of a good example.