2013-06-21 13:11:10 aaron.sevigny@LIGO.ORG
    06/21/2013 - LHO - Modify (N.A.)
        06/21/2013 Aaron Sevigny Modification Description
            Changed as stated in E1200907 for Interferometer Common Mode.
            Changes:
            R271 to 0 Ohms
            R272 to NL (not loaded)

2018-11-08 17:09:20 filiberto.clara@LIGO.ORG
    11/08/2018 - LHO - Modify (EE Lab)
        11/08/2018 Filiberto Clara Modification Description
            Modified Chassis per E1800000.
            
            Change 1:
            Change the first 2 boost stages to 10/500Hz.
            C118 ? 1 ?F
            R72 ? 15 k?
            R77 ? 332 ?
            C119 ? 1 ?F
            R74 ? 15 k?
            R78 ? 332 ?
            Change 2:
            Add two ~15 kHz low pass to the error signal DAQ readback.
            C78 ? 1 nF
            C79 ? 3.3 nF
            Change 3:
            Add a 500 Hz low pass to the slow DAQ readback.
            C243 ? 10 nF
            
            Change 4:
            Add a 15 kHz low pass to the fast DAQ readback.
            C295 ? 330 pF

2018-11-12 11:49:03 marc.pirello@LIGO.ORG
    11/12/2018 - LHO - Test (EE Lab)
        11/12/2018 Marc Pirello Acceptance Test Description and Results
            Correction, modified chassis per E1800338