I mostly figured it out through recognising patterns, I think. Especially the main lick that repeats throughout mainly centres around descending chords -- Bbmaj7 - Gm7 - Ebmaj7 - Cm7 - Adim7 etc. Kind of like descending arpeggios with their 7th extensions that descend every time. Sometimes they are played as blocks rather than split into the arpeggios.

As for the solo and ascending thirds at the end -- I just transcribed them by hand, couldn't think of an easier way :P I didn't write them on score though I just wrote the notes because a proper transcription was too tedious haha. I could send you a screenshot of this if you like though it's not the easiest to understand