If you get 20KV on the CRT pin while unplugged HV
is leaking back. The arc is the spark gap in the CRT
socket. We had a few new CC2 19" do this. Cure was to
unplug CRT, ground the focus pin & turn it on & off
a few times. That was right from Zenith TA. It fixed
them & we didnt have to change any jug under warranty.
Give that a try.
73 Zeno
LFOD!