Sorry about the confusion. I understand the difference now since I have seen inside the panel. I was thinking that pushmatic was made by FPE. It is actually an ITE panel. However, I think I have narrowed the issue down to a loose neutral on the overhead tri-plex coming into the house.

Although that may be the flicker situation, The panel still has it's own issues. Some of the breakers are difficult to get to close. It takes several times of pushing to get them to contact.

Do these also have a problem with failing to trip on overcurrent or fault like the stab-locs?

What would a person expect to pay for a replacement breaker for this panel?

Thanks, Merlin