This is the basic riff although improvised on the 2nd time through the chorus and also at the end , but the basic tab is a good starting point.
-4wah = a wah sound on the 4 hole draw, +4 = blow hole 4, -3*= a one step draw bend on hole 3, -3**= a two step draw bend on hole 3

Improvised start

Then the main tune:
-4-4-4-4-4,+4-4-5-4+4-4
-4wah, -4wah, -4wah, -4wah -4wah, -4wah -4wah, +4-3*,+4-3*-4wah
-4wah, +4-3*-2-2*-2, -2*-2-3**-2-2*-1-2*, -2-3*-2,-2-3**-2*

-4-4-4-4-4,+4-4-5-4+4-4
-4wah, -4wah, -4wah, -4wah -4wah, -4wah -4wah, +4-3*,+4-3*-4wah
-4wah, +4-3*-2-2*-2, -2*-2-3**-2-2*-1-2*, -2-3*-2,-4-4-5-4+4-4

Beat it:-
+4,-4wah-4wah, -4wah-4wah, -4wah-4-4-4,-5,-4-5wah,
+4-3*+4-3*+4, +4-3*+4-3*, +4-3*+4-3*+4, +4-3*+4-3*,
+4-3*-2, -3**-2*, -2-3*-2, -2-3**-2*

Verse as at start:- but 2nd line modified
-4-4-4-4-4,+4-4-5-4+4-4
-4, -4*, -4 -4* -4-4*, -4+4-3*,+4-3*-4
-4wah, +4-3*-2-2*-2, -2*-2-3**-2-2*-1-2*, -2-3*-2,-2-3**-2*

-4-4-4-4-4,+4-4-5-4+4-4
-4wah, -4wah, -4wah, -4wah -4wah, -4wah, -4 +4-3*,+4-3*-4wah
-4wah, +4-3*-2-2*-2, -2*-2-3**-2-2*-1-2*, -2-3*-2,-4-4-5-4+4-4

Beat it (includes some improv):-
+4,-4wah-4wah, -4wah-4wah, -4wah-4-4-4,-5,-4-5wah,
+4-3*+4-3*+4, +4-3*+4-3*, +4-3*+4-3*+4, +4-3*+4-3*,
and again
:-+4,-4wah-4wah, -4wah-4wah, -4wah-4-4-4,-5,-4-5wah,
+4-3*+4-3*+4, +4-3*+4-3*, +4-3*+4-3*+4, +4-3*+4-3*,
+4,-3*-2, -3*-2, -3*-2, -3*-2, etc., -3*-2,-3*-2

Find this on youtube under GreyOwl