Running 12 amps for that pump is not that bad. We have had them running 12 for years.
The box may say 11.5 but 12 is not out of range far enough to worry about.
The problem was more than likely just a capacitor ( the black round tube next to the silver one)
but some of the well people that are not sure of there work will just change the whole box.
I wouldn't worry too much about it.