Most likely I will be putting in a "new" dash in my 300CD this weekend, what should I be replacing as a precautional maintenance now that I will have the dash all open?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).