Theres a small bit I missed in the transition played at the end of riff 1 sounds like,
Muted a bit i think.
Slight Vibrato on each note (riff 2)
v---v dont release just play bent
Thats pretty much what i've got so far and with my talent all I can figure out for now.
riff 2 during his singing (the only one numbered), freestyle it for fun idk, have fun