Since the work last week (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=31425) did not help the problems with the OAF machine we attempted more mods today. 0900 Replaced the IO chassis with the original unit. Installed a new Onestop card in the chassis Swapped the first two ADC cards, ribbon cable and interface board. Replace the 18 bit DAC with a new one. (The old had the wrong Ram Chips) Replaced the SFP fiber transceivers for timing with new ones. None of this fixed the problem so. 1250:We just swapped the onestop fiber with another one that had already been pulled.