RIFF 1
E|--------------------------------------|
B|--------------------------------------|
G|-------------------7777777777777777---|
D|-44444444444447777777777777777777-----|
A|-44444444444447775555555555555555-----|
E|-2222222222222555---------------------|

E|------------------------------------|
B|------------------------------------|
G|-----------------7777777799999999---|
D|-44444444444442227777777799999999---|
A|-44444444444442225555555577778888---|
E|-2222222222222000-------------------|

RIFF 2
E|------------------------------------|
B|------------------------------------|
G|-44444444444447774444444444444222---|
D|-44444444444447774444444444444222---|
A|-22222222222225552222222222222000---|
E|------------------------------------|

E|-------------------------------------|
B|-------------------------------------|
G|-------------------------------------|
D|-444444444444444444444444444444444---|
A|-444444444444444444444444444444444---|
E|-222222222222222223333333333333333---|

RIFF 2 LEAD (Basic lead that improves the sound a lot)
E|------------------------------------------|
B|------------------------------------------|
G|-44444444444447774444444444444222---------|
D|------------------------------------44444-| bend this note over the progression and repeat
A|------------------------------------------|
E|------------------------------------------|
I think it's right or at least fairly close.