The good news is that the carpenter was building a box around my projector pulldown screen to hide the screen. The bad news is that he hit a heat pipe when we went to put up the box. Two sheets of drywall had to come down.
The good news, though, is that this gave me access to the underside of my dining room, which has horrendous squeaks. The dining room floor is covered with berber carpeting, so I'm afraid to screw through the carpeting, lest I cause a run and trash the carpeting. Since I had access to the underside of the floor, I covered shims with glue, hammered them between the joists and the plywood subfloor, then stapled the shims to the plywood.
No squeaks!!!
It's too bad this is only about 1/8th of the floor above this room. I had this room gutted at one time, but at that time I had so many things to do that fixing squeaks was very low on my list.