Look, the thread is going round in circles, we get what you're saying but if you really want to check then you'll need to open things up and see what's behind the finishes, so that will be an expense and lots of work and you might find things are afoot which need further destructive works and expense to put right so it begs the question do you want open that Pandora's box or just get it signed off and deal with any issues that may arise in the future. It seems a no brainer to me which route to take.
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