This is most likely pretty wrong, but without this you would have nothing, i watched how brian played it at the shows, and this is as close as i could figure it out.

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|0--3--5-5--3--5--xx--0-3--5-4-3-2------------------------------------------|

That is the main riff. during the verse it is just bass and drums. the chorus is power chords, the notes are: G, A, B, A. It's very easy to figure out when you listen to it.

The bridge is the same as the chorus.
This is hwat you play at the end:

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|0--3--5-5--3--5--xx--0-3--5-4-3--------------------------------------------|