the intro is done on bass but i tabed it for guitar
the second riff sounds right.

- palm muted

 (clean) bass intro
 |------------------------------|
 |------------------------------|
 |------------------------------|
 |------------------------------|
 |------------------------------|
 |-0--5--4--3---0--5--7-5-4--3--|
  
 (distorted) guitar intro
 |-------------------------------------------------------------------------|
 |-------------------------------------------------------------------------|
 |---7-7-7-7---------9-9-9-9---------10101010--------14-14-14-14-12-12-12--|
 |-------------------------------------------------------------------------|
 |---5-5-5-5---------7-7-7-7---------8-8-8-8---------12-12-12-12-10-10-10--|
 |-0---------0-0-0-0---------0-0-0-0---------0-0-0-0-----------------------|
             - - - -         - - - -         - - - -