I have a mystery Bianchi frame with an identity crisis. The stamping on the bottom bracket is L.6 and 25516. It has Columbus and Made in Italy decals on the seat tube. There is also a 1986-87 world championship (Colorado Springs) decal on the down tube next to the head tube. The decal that should give me the model name on the top tube is missing. The frame is pink and the Bianchi logos on the seat and down tubes are reddish.

What do I have on my hands here?

Thanks,
Brian