We performed follow-up tests observations on April 8, 2004 to try to confirm the findings from the April 4, 2004 tests. We decided to use the C-band receiver to test that the non-linearities are primarily not in the receivers. We took data with the DCR with signals coming from the V/F output of the IF Rack and then from the Analog Filter Rack V/F outputs. This was to test that the problem existed for the DCR as well as the spectrometer and to try to isolate whether or not the optical fibers had a non-linear response. While the DCR was being run from the Analog Filter Rack we also ran the Spectrometer simultaneously.