Someone who worked on this set previously moved C133 from the bridge down to the main chassis. It connects to pin 6 on the the 6AU6 horizontal control. They took a piece of twin lead and spit it in two and ran that from C133 back up to pin 6.
I can't understand why they did that. It looks like the original electrolytic since it has a Sylvania part number on it. I'm inclined to move it back to the bridge unless someone can come up with a theory as to why it's better in the chassis. The long run to pin 6 seems strange.
The schematic and layout can be found at:
https://www.msu.edu/~yurkon/Sylvania_9-2_Sup2.pdf
John