I have a 617. When you pull the hammer back, there are three clicks - first the cylinder lock, then the pawl, then the sear. All are normal. You may be hearing the pawl slipping back down once cocked.
On mine the hammer also clicked in double action when passing the lock mechanism on the left side of the hammer. I removed the lock and filled the hole with a Lock Delete, and no more click there.
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Heavily armed old man.
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