Hi Rich, there are something like 4 .005@6000v tubular caps under the chassis and another inside the HV cage I think.
These will have to be changed, I'd bet that's where your HV is going.
These are available through Allied Electronics
http://www.alliedelec.com/ or Antique Electronic Supply
http://www.tubesandmore.com/
Ultimatly Compucat is right, you'll have to replace every paper and electrolytic cap in this set to make it work right, a pretty easy task on that chassis.