It's always nice when someone takes a crap in the room and then leaves.
After listening to Grateful Dead music for over 30 years (God, has it been that long!) and playing it for over 25, I am reasonably sure that the chords are correct.
Perhaps gratefulpat is attempting to play along with one of the many other artists' interpretations of this old, traditional number.
My guess however, is that we won't hear from gratefulpat again, and we certainly won't see a "correct" tab posted.
Let's move on, folks.
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Last Show - 3/28/93