Well, I have great news. The monitor is working now! It turns out that the SAM's Photofact that I bought has some bad information in it. The output transistors are NEC C1507. SAMs has the replacement listed as a NTE198; which I bought and replaced all of the C1507's with NTE198.
When looking at the system, I couldn't find any place where the 4Mhz noise was coming from; but, as you stated, the noise was sinusoidal. Then, it dawned on me that the transistor could be creating the oscillations. I then started looking at the datasheet. The NTE198 has a minimum bandwidth of 10mhz, while the true C1507 has a minimum of 40Mhz. So, with this difference in mind, I took some of the older working C1507's and replaced the NTE198's and turned off the red channel with the NTE198's. Brilliant clear picture on those channels.
I've ordered some C1507's to replace the two that were bad. I'll report next week when they come in, but the difference is spectacular.
I'll report back next week; but, it looks like one more 5154 is back in the world.... ;-)
Chris V.