I often see moisture problems under laminate. If drywall has 80%-100% moisture content, you can put your finger through it. Is this an exterior wall? If so, I'd map out where the high moisture readings are and then look outside to see where the rain is getting in. Water won't rise up from the ground to cause this. Anyone with a good sense of smell. I've done "smell" work before. I have about a 50% success rate. Water doesn't do that. Capillary action can pull it up a short distance, but the moisture levels will always be greater at the bottom. If there are high moisture readings high on the wall, the water is coming from above. (Unless something else is fooling your meters.) You don't need to cut a large hole in a wall to confirm or exclude a moisture problem. A 1/4" hole will do the trick and can be easily patched.
source https://www.inspectorsjournal.com/topic/18979-can%E2%80%99t-find-source-of-mildewdamp-smell-in-rental-house-a-real-mystery/?do=findComment&comment=173425
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