Suspect Y2-8 ion pump is not working properly. There was a pressure rise in Y-arm on Saturday, Jan. 7th at around 11:30 am local time. Attached is y-arm pressure trends. Purple curve for PT427, located at Y2-8 (250 m down from EY), shows the sharpest increase. We will investigate the controller located in EY mech. room after snow is cleared. Bubba and John couldn't get past warehouse today in truck.

References on faulty HV cable:

aLOG 28857

aLOG 28847

aLOG 28818

IP5 controller (corner station) failed 6.5 hrs prior on Jan. 7th coincidentally.