1L18 HPA had repair work done yesterday Sam found a broken wire (current sense resistor) in the HPA late afternoon. I repaired that connection also replaced the ground cable to the ground stick Sam will inspect that this morning. Resistor for Klystron 3 looked bad but it measured 49.8 ohms all good. They will continue work on this zone this morning.
Zone dropped out of HV on Cavity 4 GMES fault, as it has many time over the past days.
However, when I was trying to recover the zone this time, something very weird happened.
All of the cavities were off, zone was put back into HV, and I started to turn the cavities on one-by-one.
Turning on Cav 1 introduced some GMES into Cav 4, dropping the zone out of HV.
Fig 3: Can see a GMES response in Cav 4 when Cav 1 is turned on. R2L4CRFP is reading zero (I think the readback for this may be a bit funky) as well as R2L4GASK.