SS,
I had something similar to what you describe. It took me a while to find (them). First was the plastic surround from the cover over the red flashing alarm LED light (centre/rear) on the dash. Had just worked loose and needed a firm press back in place.
After i did that i had another, this was a little toughter to locate. It turned out to be the top of the seat just touching the leather covering on the roll hoop, Just bought the seat-back up a little and bingo - sorted!
May not be of any use to you but i like talking to my brothers so i thought i'd share it anyway.
