I have found that if you remove the filter the working time doubles. Since it's in the house I'm tempted to leave it off.
Also, there's a nice hot 6080 right below the transformer, slowly cooking it. I'm tempted to make a small heat shield right below the transformer to separate it from the power chassis below. This should divide the air from the fan a little better and keep the heat off the transformer some.
On a side note, if this doesn't work well, who's still rewinding these transformers these days?
And Brian, there are two transformers on the HV supply chassis, one on the right side is a 120-0288-00, which is the HV transformer. It's enclosed in a metal case. This is T801.
See
And here's the schematic, the smaller transformer on the left side is T841:
Eric Boyle