Modules 9-12 for all of Chamber 4's U-planes have shown to give no signal according to the replays of recent runs. Mark and I found today during a Controlled Access that the threshold cable had fallen out. We reconnected this cable and got all of these modules back. This leaves us with one more problem module, Module 5. We investigated what may be causing this module to not output a good signal and Mark suspects its a HV problem. We will investigate this further tomorrow.