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Here's what I would do. cut out the sub floor (on the joist) and look under there for damage on the floor joist. have a go at it with a screw driver and don't be shy. If you are worry, call your termite guy and treat the area. I have talk to many, they don't thnk it does any good. Local treatment. Its like relocating a bum in santa monica to torrance. they are still there just not at santa monica. replace the joist if its bad. If there's bounce on the floor, now its the time to take care of the problem. Sister floor joist to the existing or blocking might help. bounce may cause cracking tiles, stone, or grout joint. It doesn't look like a big deal in the pic. let us know how it goes.
Jeff
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