It sounds like you do need to remove the coroplast and inspect. This is not hard to do but if you really want to see what's going on under there then i don't think you have much option. As you say, these roads are rough and you may have a coupling that has come loose or a part. I figure though if a joint has come completely a part then you would have water filling the coroplast and leaking around the edges. Good luck.
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