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From: Lake Arrowhead - Georgia > 72 Base Coupe & 74 BB Roadster
The "buckets" are easy to rebuild with a kit from ZIP...about 19 bucks each. Each bucket has 3 parts....2 rubber seals and a metal retainer.
The smaller relay valve(s)....I am not sure it can be rebuilt. I have had luck with spraying the rubber seals in the relays with lubricant....it causes the dried out seals to swell and they stop leaking vacuum.