All rubber components on the T1 T2 water solenoid valves were exchanged on Jan 22, 2025.

To service the heat exchange water and all collimator solenoid valves, the low active copper supply line in the 1A tunnel had to be shut off (see pictures). Note that the shut off for the T2 secondary water did not work perfectly, it is possible that there either the valve was not shut off properly or there is another shutoff valve in the 1A tunnel that needed to be turned (see picture of 'T' on T2 supply). When exchanging the rubber seal and o-rings on the T2 parker heat exchanger solenoid, approximately 1-2L of active water flowed out from the valve opening onto the blocks. When returning into the 1A tunnel at the end of the valve servicing job, no dripping water or pools of water was found.

The solenoid bodies and connectors were not exchanged, but we will check that they are working properly after re-filling the systems near the end of shutdown.