I recently listened to a two-CD set of the Isley Brothers, and the bass part for the single version of "Respectable" sounded really easy, so I figured it out and notated it:
I considered writing in the chords, but since they last for only one measure each, I thought it would make the notation look too cluttered. The bass part just arpeggiates the chords played above it: F major, D minor, Bb major, and C major.
The F major/D minor arpeggiations continue until the fade out, so I put four measures of them within repeat signs, but the fade out actually doesn't last much longer than that.