Watch the '61 SGLP: Solo Section online guitar lesson by John Jorgenson from Eclectic Electric: 61 SGLP
The second phrase of the solo is comprised of a lot of really fast pull offs on the D, A, and E strings. The D and A you pull off from the 2nd fret to open on both. On the E string, you pull off from the 3rd fret to open, and you repeat them as fast as possible. After you've done three of them, you stay on the D string three times, then move down to the A string and pull off one time.