Soft spots in hardwood floors

Hi!  We've done a few projects on our house and are noticing more and more soft spots with our hardwood floors.  Does anyone know a floor company or person?  We think we may have to remove some boards, strengthen the boards underneath and then put new boards with finish.  Would prefer to not go through a contractor who tend to just sub out these activities.

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RE:

Lam Nguyen of Nviro Floors is the best!  He does all my clients' floors (I am a real estate agent) and he does mine too.  He is courteous, professional, reliable and does an amazing job at consistently amazing prices.  Ten stars!  510-507-1160.