Gruffy,
I checked the floor again, seems the floor is loose in a small area. I had to check several times before I could find the spot. I removed the louver from the middle heat duct and found the floor was loose where it meets the duct work. Floor seems to be 1/4" thick and held to the decking with adhesive. The area loose is roughly the width of the duct and 18" forward. It is not bad, but I am concerned it may be a problem in the future. Thanks
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