Well all the LC's should all be do, all of mine were bad, just ask UNI he did them all for me last year it was I think, maybe the year before.  The 6100 is the same age pretty much, I just had to do my quadra 660 and my 6100 due to non boot.  So if they have been sitting even with non use they will age and leak, or dry up inside.  My 6100 didn't leak they were just all dried up, same with the quadra.  Might have been the fact there was more cooling, and more spread out, not sure of course.