It doesn't really matter what coolant you use, the galvanized covers will still corrode. And then the coating becomes a sticky gooey mess and aluminum chips weld themselves to it and the welded chips destroy the wipers pretty much immediately. The only fix, I think, is to completely remove the coating with a wire wheel or whatever. This is less work than the alternative of constantly trying, in vain, to keep welded chips off and to remove the sticky film.
Haas is a garbage tier company.
About the $500 code, at least on my 2013 Haas with the old control, a (non Haas) service tech was able to get into the parameters and orientate my spindle to the tool changer, and I have not paid for spindle orientation. So at least with the old controllers up to a certain point, no money was required to adjust the relevant value.