What generation Chorus is your's? If it was the previous generation <2006, then it's the same as the Record and Centaur. I posted about a problem in a Record freehub I acquired. It looked fine, but had a lot of resistance to turning on the axle.
Turns out, the bearing packs can flex and drop into the hub shell, past the bearing race, if one assembles the parts carelessly.
Once properly placed, the freehub spun fine and smooth.
If the LBS determined the damage was the cause of your's, I guess it's resolved. If it was a 90's era Chorus, not familiar with its design and failure states.