RCA VBT200 video output issues

[INTVman]

I have been working on a RCA VBT200 VCR for about a year now and have finally run into a problem that I can't seem to figure out. The color picture seems to have completely died and the AV output stopped working. This problem manifested slowly as I continued to work on the machine. It seemed like the longer it ran, the more likely the color would die and the machine would have to cool down for it to come back. This is how it was for about two weeks than the color completely died. For a little bit the machine worked just fine, playback was perfect except for having no color then the AV (the best quality output the machine has) stopped working. The AV picture flickers to black every second or so, yet the sound continues to play. The RF picture still works in black and white, but has faint lines running across the screen at a 45 degree angle so it must be related to the heads. Any Idea what might have failed and if it can be fixed?