71191402 2024 064 21:40 3 6.01 Re-seated internal and external BNC cable connectors on ETM 
71191402 2023 285 23:00 2 9.02 Installed GPS antenna splitter for CNS and Rubidium XLDC  
71191402 2023 221 20:00 3 6.01 Replaced ETM power supply  
71191402 2023 202 23:15 1 5.01 Replaced dead start diode batteries  
71191402 2023 089 01:40 1 12.01 Replacement MET4, sn 149703 installed, sn 109197 removed. 
71191402 2022 314 04:00 2 9.02 Replaced Truetime XLDC. Replacement s/n 99173236 
71191402 2022 260 00:00 2 6.01 Operations change to 2900V for all satellites and calibrations  
71191402 2022 231 21:17 0 99 Install new Dell 7920 replacement processor computer with CENTOS7 
71191402 2022 029 18:00 1 12.01 Replacement MET4, sn 109197 installed. Sn 117660 removed from service. 
71191402 2021 161 02:45 1 5.02 Frequency synthesizer s/n 824432 failure. Replaced with FS s/n 2095. 
71191402 2021 147 06:05 1 5.02 Laser frequency synthesizer s/n 824432 installed  
71191402 2021 002 20:15 1 5.02 Laser frequency synthesizer electrically isolated and grounded. 
71191402 2020 312 00:31 1 6.01 Install NASA Engineering Change 3273C. Improved grounding for the Event Timer Module. 
71191402 2020 241 00:13 1 5.02 Install NASA Engineering Change 3395C. Start diode cable upgrade. Noted about a +15ns change in system delay. 
71191402 2020 219 01:30 1 5.02 Install replacement frequency synthesizer. s/n:2095 
71191402 2020 185 19:30 0 5.02 Remove 1 ND from laser transmit insert. Thickness of glass removed is 0.001186 meters. GEODETICS.dat not changed. 
71191402 2020 154 22:00 0 99 Install replacement data processing computer. 
71191402 2019 313 01:10 1 6.01 Discriminator Cable Change. Move Cable 215 from Transmit Non-Delayed Channel-A to Receive Non-Delayed Channel-C. This enabled Receive Energy Recording 
71191402 2019 262 22:30 1 9.02 New CNS clock installed s/n:801019  
71191402 2019 236 19:06 1 12.01 MET-4 replaced. s/n:117660  
71191402 2019 166 02:40 1 5.02 Install replacement laser frequency synthesizer. s/n:824432 
71191402 2018 292 19:50 0 99 Install replacement controller (servo) computer. 
71191402 2018 122 00:00 1 5.02 Install replacement laser frequency synthesizer. s/n:806256 
71191402 2018 021 00:00 2 5.02 Return to 5Hz laser fire rate for all targets. 
71191402 2017 300 18:00 2 5.02 Go to 10Hz laser fire rate for all targets less than LAGEOS1/2 orbital height. 
71191402 2017 292 20:00 3 6.01 Changed time of flight measurement from HP5370B to Cybioms ETM-02 (serial number -012) 
71191402 2017 158 21:00 0 5.00 Move laser chiller from Electronics Trailer to adjacent CMU building. 
71191402 2016 338 02:28 2 6.01 Install new RCC (Range Control Card). 
71191402 2016 327 00:40 1 9.02 Swap CNS Clock with another unit. s/n:80120 
71191402 2016 126 20:00 2 6.01 Install SLR Engineering Change (SCNS-SLR-EC1296). RCCard Upgrade and TCG Removal. 
71191402 2015 200 00:00 1 12.01 MET-4 replaced. s/n:117555. 
71191402 2015 047 00:00 1 4.01 Replace Transmit/Receive rotating mirror with partially mirrored lens. 
71191402 2015 043 00:00 1 4.01 Replace telescope motor and position sensors. Both axes. 
71191402 2014 191 19:30 2 6.01 Swap out HP5370B with another unit. 
71191402 2014 102 02:50 2 9.02 Replacement GPS XL-DC installed. 
71191402 2012 362 20:59 1 12.00 MET-4 Installation 
71191402 2012 310 23:26 1 99 SATTRK and MONITOR software updated on the controller computer for MET 4 support 
71191402 2011 223 04:05 2 6.01 Installation of replacement HP-5370B counter 
71191402 2010 214 19:00 2 9.02 Replacement GPS XL-DC installed. 
71191402 2010 184 00:00 2 5.02 LASER replaced with saturable absorber upgrade.