Originally Posted by temon00

For posterity's sake, I will share the solution to my problem, which could easily occur on another brand of fork. It was so simple that I feel a little foolish for not figuring it out sooner.

The noise was coming from the upper spring end rubbing against the inside of the inner leg. I thought that the seepage of oil from the damper would sufficiently lubricate the spring, but when I spread some polylube all over the inner leg (get your mind out of the gutter), the noise went away. The fork is quiet and I finished the tuneup without a hitch.