On my sunday bike, 2008 C'dale Bad Boy disc, the little red finger gear indicator has been stuck on '9' for couple weeks. It shifts perfectly. I just look down to see what gear I'm in, but the indicator doesn't move. It's a SRAM X.7 (I think) 9 speed. I have not taken it apart. My ?s- Can it be repaired? Is it worth the bother?