Happy Holidays, all!

What do you all do when the Utility's design letter/AFC calculations contain info you know is incorrect? What is our responsibility to the Utility in such cases?

On my most current project, the Utility's stated incoming conductor information is incorrect, both in quantity of conductors and size(8 parallel 750mcm vs 4 parallel 350mcm). I know because I have photo documentation of what's landed on the utility side of the gear. This happens somewhat regularly.

Obviously I want my study to be accurate, so I'm going to model the incoming as the Utility states it and make sure the AFC matches, then see how different the AFC will be with the actual installed conductors.

If, in this case, the AFC was close, would you send a courtesy note to the Utility to let them know their info is incorrect? Do we have a responsibility to do so? If the AFC was significantly different using the installed conductors, does the courtesy become a responsibility?