2012-05-22 12:10:41 anna.aitken@LIGO.ORG
    05/22/2012 - LLO - Receive (CER)

2013-05-14 11:12:03 carl.adams@LIGO.ORG
    05/14/2013 - LLO - Install (Installed in ISC-XR1-28)

2013-09-12 13:56:40 carl.adams@LIGO.ORG
    09/12/2013 - LLO - Modify (N.A.)
        09/12/2013 Carl Adams Modification Description
            As per LIGO-E1200907-v1
        09/12/2013 Carl Adams Manufacturing Notes
            Replaced R271 with 0 ohms
            Replaced R272 with NL
            Replaced R68 with 3.6 K ohms
            Replaced R69 with 18 K ohms
            Replaced R70 with 4.53 K ohms
            Replaced C121 with 220 nF
            Replaced C118 with 1 uF
            Replaced R77 with 165 ohms

2013-09-13 09:48:30 carl.adams@LIGO.ORG
    09/12/2013 - LLO - Install (Spare, in storage)

2014-07-09 07:03:09 carl.adams@LIGO.ORG
    07/09/2014 - LLO - Modify (N.A.)
        07/09/2014 Carl Adams Modification Description
            modification of the ALS PDH servo boards:
            Similar to:
            https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=9357
            
            Compensation filter changed to 40Hz/4KHz pole/zero
            1st boost stage changed to 10Hz/1KHz
        07/09/2014 Carl Adams Manufacturing Notes
            Replaced R68 with 1.21 K ohms
            Replaced R69 with 120 K ohms
            Replaced R70 with  1.18 K ohms
            Replaced C121 with 33 nF
            Replaced R72 with 15 K ohms