here's a quick little bass line

RIFF 1!

G---------------------------------------------------------------|
D------------------3-3------------------------------------------|
A-3-3--1-1-0---0-3-------3-3---1-1-0---001122-------------------|
E----3-------1---------1-----3-------11-------------------------|

riff 1 ending

A----3-3--1-1-0--------|
E--------3-----1-------|

RIFF 2!

G-------------------------------------------|
D-----3-5-3-5-7-5-7-5-x---------------------|
A---5-------------------7--888-77-55-333----|
E-3-----------------------------------------|

G----------------------------------10-10----|
D-----3-5-3-5-7-5-7-5-x-------7--10-----10--|
A---5-------------------7--888-8----------8-|
E-3-----------------------------------------|


RIFF 3!

G--------------------------------------------------------------------------|
D--------------------------------------------------------------------------|
A----------------3-----------------5-3---------------3---------------------|
E-5-345-345-3535----5-345-345-5353-----5-345-345-3535--5-345-345--3-1--0---|

ORDER

Riff 1 x1
riff 1 ending x1
riff 2 x1
riff 1 x1
riff 2 x2
riff 1 x2
riff 1 ending x 1
riff 1 x2
riff ending x1
riff 3 x2
pause
riff 1 x2
riff 1 ending x1
riff 1 x2
riff 1 ending x1

and thats it!
95% correct theres just a slight variation to the end of riff 2 that he does

hope you like it