Summary:

We're reviewing the HWS SLED situation.  We have only one spare for the ITMX SLED and no spares for the ITMY SLED.

We're averaging about one SLED every 8 months during intensive usage.

ITMY

• April 2015: replacement [ITMY: QSDM-840-5 12.02.44]: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=18069
• July 2016: replacement [ITMY: QSDM-840-5 07.14.264] https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28162
• October 2016: replacement [ITMY QSDM-840-5 07.14.265] https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=30257
• May 2017: replacement [ITMY - QSDM-840-5 7.14.266]: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=36174

ITMX (not used as much before in-vac lens fix)

• March 2016: status check [ITMX QSDM-790-5: 12.05.21]: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=25907
• July 2016: replacement [ITMX QSDM-790-5: 07.14.256]: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=28358
• April 2017: replacement [ITMX QSDM-790-5: 07.14.254]: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=35486

In storage cabinets next to BSC3.

• QSDM-790-5: 07.14.255 [should be okay]
• QSDM-790-5: 07.14.256 [dead]
• QSDM-840-5: 07.14.265 [dead]