Fix of Sagging Subfloor in Residential Home with I-beam TJI Trus Joists

I was having the carpets replaced in my home. Made a last minute decision to fix the a few "soft spots" in the flooring. There were a few specific spots where I could feel my feet sink slightly when walking on the floor. Having various power tools on hand I dove in and removed the current carpets and opened a section of the flooring to investigate and fix the sagging sections. Fortunately it all worked out well. The floor was solid after my repair job.
Certainly not a professional but the work felt solid enough for the moment.
Video quality could have been much better but, nevertheless, hope it helpful for someone.