this is the main riff
e————————-
b————————-
g-0-0–3-5-3–5—-3-0—-
d-0-0–3-5-3–5—-3-0-3–
a———————-3–
e————————-
e———————
b———————
g-0-0–3-5-3–3—5—
d-0-0–3-5-3–3-3-5—
a—————3—–
e———————
i just worked this out so it may not be right but it sounds right.