[Heathkit] Help on HO-10 Update "almost"

[OTAKEBI at aol.com]

Found one bad resistor on the focus pot and replaced it.
Also replaced a 100 ohm resistor on back of the CRT coming form the focus pot.
Now trace is sharp with the focus control all the way clockwise.
However, I have fuze and trace is still out of focus on the left side near 
the end of the trace.
After about 15 minutes line goes out of focus again.
The 1600 volt .15 mfd caps can't be found.
Any information from someone who has fixed this problem or located caps?
Thanks,
Dan/N4VET