Intro:

G-----------------|
D-1-1-1-1-1-1-1-1-|
A-----------------|
E-----------------|

Main Riff:

G---------------------|--------------------------------|
D---------------------|-----------------0-1-0-1-3-0-4-.|
A-3-3--3-3--3-3--3-3--|-3-3-3--3-3--3-3---------------.|
E---------------------|--------------------------------|

Bridge:

G------------------------------|
D-----------------------------.|
A-4-3-3-3--4-4-4-4-3-3-3--4-4-.|
E------------------------------|

I think those are the only three bass riffs, and they repeat over
and over.