I live in Ohio, have a basement, and think I have a moisture or a bug problem with my oak(?) hardwood floors. Last year the floor started to squeak in the winter and show dark signs around the seams of the boards. The subfloor(?) in the basement only shows very light stain looking spots on the wood. This year the floor is squeaking more and the edges of the planks are even darker. I have noticed little burn looking spots on the wood.

My question is how do I check for moisture or bugs without destroying the wood floor or subfloor? I am a complete novice at this home repair stuff.

Thanks, Hijeanne