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knocking noise when a/c runs


i have an 1987 4227 cockpit motor yacht. Recently started to hear a noise at the back of the boat on the starboard side only when then a/c is running. Sounds like a baffle has come loose. There is a cavity that is inaccessible. Both the starboard engine exhaust and a/c pump line lead to this cavity which is exactly where the noise comes from.
Any thoughts on what this issue is or possible solution would be greatly appreciated.

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