Call around, you should be able to find a shop that will do it. We charge $30-50(not counting parts) to tear down a fork and clean it, relube and replace the seals. More for bushing replacement.
There is a tool for installing the seal, it inserts in the seal and keeps it square when you tap it in as well as giving you something to tap against.
Are you sure the air is getting past the seals? Sometimes it is the air valve.
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