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Foam rot is a serious thing as it can damage the pcb and electronics, causing malfunction, etc.
I am not completely sure about which serial number has the improved foam, but I think 12xx xxxx might still have the old foam.
My advise for proper action is not to apply self cut pieces of plastic. This will not help, because when foam rot is there, it is already damaging the pcb and components. The only way is removing the old foam and thoroughly cleaning the pcb and components.