Yeaahh, its a great little solo, especially as guthrie probably improvised it.
Maurice, it starts on the B note on the 19th fret, and goes down chromaticly to the 16th fret, then the same pattern but on the B string. If you download a program called Audacity or Transcribe, you can slow audio files down to make it easier to work out

I hope this helps. If there is any phrases anyone wants me to have a go at working out and making a video, please let me know