3x 3/4" swagelok ball valves (2x at T2 and 1x at T1) were replaced after the water cooling line was shut off at the BL1A tunnels late yesterday. 

We were able to relieve pressure from the T2 water cooler + M8 colA/B (they are the same line) at the BL1A tunnel through a drain port but no such port exists for the T1 heat exchanger line in BL1A.

The T2 heat exchanger line was virtually dry at the replaced valves after pressure was relieved.

The T1 heat exchanger line was still pressurized but while looking for a suitable port to drain at the cooling package, one of the copper fittings at the 1/4" heat exchanger line broke off at the connection to a green valve. 

~1L of water dripped from this line and this was sufficient to relieve pressure from the T1 heat exchanger line - allowing for the 3/4" ball valve to be replaced. 

Until the green valve gets replaced, the T1 heat exchanger line must remain shut off in the BL1A tunnels as the broken copper line is not plugged currently.

Update (last picture): the green valve was replaced with an equivalent 1/4" swagelok ball valve. We also incorporated two 90 deg. bends in the copper tubing to help relieve any stresses that may develop.