On this step, a small threaded barrel came off of the bottom of the housing, once I lifted off the logic board. Upon reassembly, it goes back in with the tiny threaded part down, into the silver piece near the rear facing camera. There is a little hole in the silver to receive it. When the logic board goes back down it matches up with a small silver hole and then secured to the rear case with the 2.7 mm standoff screw furthest to the left in the photo in Step 35. Take care not to put the barrel in upside down because it is very hard to get unscrewed once placed incorrectly.
On reassembly, it was tricky for me to figure out where the gold clip went. It goes against the back case, upside down and holds the logic board grounding clip, mentioned in Step 34. The upper hole of the grounding clip goes into the gold one, with the opening of the gold one oriented to the right. The 1.2 mm Phillips #000 in the top side-wall, removed in Step 33, holds them both together.
Yay!!!!! I did it! I followed all the steps, keep organized with little pieces of paper inside mini muffin pans with the screws and pieces for each part and it worked!! Now my volume, silent, flashlight all work!!! Thank you for the instructions.