2010-10-08 (2010B-0030): 8 hrs used, 1 hrs lost (Instrument problem), 1 hrs lost (Telescope control problem) Comment: Techs diagnosed diagonal lines in bias frames by sunset, but after that, we saw random noise varying between 50 and 300 ADU that limited our faintest objects to about V~19. After George Will swapped interface boxes around midnight, that cured the problem, and our limiting magnitude due to seeing, etc. was ~ 22+. We noticed the guider drift box signs are reversed from previous visits to this telescope.