V4 PCB component repair/updating

[beedoola]

I got a V4 project that I'm getting ready to order parts for. I already have plans to redo the filter caps, screen resistors, plate resistors.

I had been told that the coupling caps sometimes need replacing. Are the coupling caps in these pictures the small silver caps on the big PCB?

Also, you'll see a burned spot on the big PCB near the screen resistors, the resistors don't seem to be compromised but I wonder what else there is.

Anything else that should probably replaced/updated? Diodes.

I'm also going to replace C16.