325i Convertible Top Damage

I have just bought a 1987 325i convertible. The top shows spots of wear
damage where the top fabric rests on the ends of the frame crosspiece.
The fellow that I bought the car from said that BMW issued a repair
bulletin that covered a modification to the top frame that reduced
chafing of the fabric at these points. These wear points are over the
doors. Anyone know if this bulletin exists and where I might find a
copy?

Thanks

Ray