Some were by the wire that I needed to connect to that area of resistors. I replaced the crystal with a new one and I replaced all of the capacitors and 2 chiclets. I highly recommend the AV mod because apparently, (after talking to somebody who repairs game systems for a living), many RF modulators on the 2600 are starting to die out.
Specifically, I checked every resistor - whichever ones were dead, I replaced. I had to eventually send the board to a pro though, but I do have a decent idea of what he had done in order to solve this odd problem. He pretty much did what I was able to do, just at a more advanced level of proficiency.