I'm pretty sure this is right, and I have included timing to make it easier.

Feel free to correct it.



Notation:
  PM--| = Palm mute
  p     = Pull off


Main Riff:

   |1---2---|3---4---|1---2---|3---4---|
   |
  E|--------|--------|--------|--------|
  B|--------|--------|--------|--------|
  G|--------|--------|--------|--------|
  D|5-------|7-------|8-----7-|--5-----|
  A|5-------|7-------|8-----7-|--5-----|
  E|3p0-0-0-|5-0-0-0-|6-0-0-5-|--3---00|
      PM---| PM-----| PM---|       PM--|


End Main Riff:-

   |1---2---|3---4---|1---2---|3---4---|
   |
  E|--------|--------|--------|--------|
  B|--------|--------|--------|--------|
  G|--------|--------|--------|--------|
  D|5-------|7-------|999-999-|999-999-|
  A|5-------|7-------|999-999-|999-999-|
  E|3p0-0-0-|5-0-0-0-|777-777-|777-777-|
      PM---| PM------------------------|


Cheers, and have fun!