I've never worked for a dealership, so I have no idea if I should be surprised that they've even taken a TJ in for some nonregular diagnostics for a problem that didn't have a recall or service bullitin but I am kinda surprised. I'm also wondering how they could even find a steering column.
Steering column, hmmm.... there's a power steering gearbox at the front end of it. Maybe that's the problem.