Found my documentation
I wrote them last night and they replied early this AM. They confirmed what you said, that you need to remove the buss bar for the entire column.
That makes it a much more complicated job as that row of 8 is right against a bulkhead when the panel is swung down, very little room for my hand let alone a screw driver.
The good (?) new is I swapped wires to a different breaker and the problem followed, so it's not the breaker.
The bad news is it seems to be something with my fridge. It's throwing a low voltage alarm
. It seemed to go away if I operated the breaker a couple of times and would then operate properly for some time, maybe days. So I guessed the breaker had a high resistance contact. Apparently not.
Thanks for your info.