First freeze plug on right side of engine - just aft of alternator - is leaking like a sieve. Advice on easiest and/or best way to fix would be most welcome. Should I replace all and get it over with? Thanks.

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Boomer

whatever happend? Why would a freeze plug start leaking .... rust presumably ..... but why?

cheers

To answer your question: Remove the leaker, and determine why it's leaking. If it is in fact rust that is causing the issue, then yes, you will need to do them all , if practical.