I used to fly the 120 and we have had the same problem. Lots of chip lights, both ENG and X-MSN and when we pull them out we usually find very small shavings or nothing at all. It still gets my blod pumping though, flying around and all of a sudden that light comes on. I fly over water and I find that a little less comfy than beeing over dry land when it comes on. Anyway...it seems to be a pretty common problem withthe 120.