I pulled the chassis out of the cabinet and give it a once over with the air compressor. Man at the 50 years old dust I ate, I guess I should invest in some paper dust masks next time.
Well I did a quick inspection of the unit, I've got a few resistors cracking and showing oxidized leads. Also I saw some oxidation underneath both of the cap cans. I didn't notice anything funky looking where I saw the arc at, but I assume it was created by something down-line and not at the site of arcing. I inspected some of the tubes in anticipation of using a friend's hickok when I noticed one of the tubes are different than specified by the tube layout printed on the back of the tv and on the chassis. The tube is supposed to be a 12DQ6A, but instead is equipped by a 12CU6. I looked these up on rm and noticed a distinct voltage difference off pin 5.
This is the equipped tube showing 72.5 volts on pin 5
This is the required tube showing 22.5 volts on pin 5
I believe I am reading this right, they are not listed as compatible tubes so I assume this is the wrong tube.
I plan on ordering caps next week, and testing the specs on the resistors, specifically the suspect ones.