Any monitor specialists on EE?

To do what you want you need to find the adjustments for the amps for the RGB signals.
Those should be on a PCB (circuit board) somewhere inside the casing.
~ Probably on the board you just replaced.

That doesnt help.  Be more specifc, are these the adjustments on the yoke?
Everyone knows there are adjustments for RGB, the question is where are they?

They might be in a small, square, metal case(s). With a round "screwhead" in them.

Coral47 - thank you for help, there are NO pots on the main board.  The only pots are on a box mounted above the yoke, none of them are labelled as to what they do.  My *guess* is that one is for brightness, the other for contrast, and the other 3 for RGB, but I think this guess is more *hopeful* than realistic?  But they are all identical with the small slot for either flat or philips screwdriver, as you expect on monitors.

Also, I should note, the only inconsitency (illogic?) on main board is that there is a 3-pin plug on board, but only a 2 pin male plug to go into it.  This plug wires lead up to the small square metal box mounted above yoke where these Pot controls are.  I could move the 2 pin plug across the 3 pin block, but I am a bit afraid of blowing out the mainboard in doing this.  Also note, specs for this monitor not exist on net.

PC BONEZ -- OK, thanks, I will leave those 5 pots alone on the yoke, I had a feeling they would be for convergence and beam geometry.  No pots on main board, so the only adjustment must be in the BIOS.

 I think the problem is my last comment above -- a 2 pin plug in a 3 pin socket.  I will take a chance and move the plug to the other 2 pins, that will either blow out the board, or fix the problem.  

jhance, it is not a matter of color adjustment, it is as if the red channel has no gain at all.  Wish me luck.

Another instance of the same thing:

http://sci.tech-archive.net/Archive/sci.electronics.repair/2004-06/1810.html
.

Yes there is basic G2, gray amp and RGB color adjustments in the service menu under 7711, I already knew that, and you can make significant changes there, but not to the effect of recovering a lost R, G or B channel. As I have said from the start, there are no pots on the mainboard, must be all in the service BIOS.

The 2 pin connector is one of 3 coming from the daughter board that sits behind the module that plugs into the back of the yoke, and I am now assuming it is relevant to the color.  No, it is not a high voltage circuit, that is separate and working.  It is possible that the replacement board I got has defective R or G (most likely R), I will try moving that plug and see what happens.  Silly to put a 2 pin plug into a 3 pin socket on the motherboard, but that is the way they did it, and there are no diagrams available for the monitor.

Thanks for your help, I will let you know what happens tomorrow.

A passing thought...
the red gun itself, might be gone. And as far as I know, you need the correct test gear to work on that.

Im happy to say the monitor is working with the flip of that 2-3 pin plug, and I would like to THANK all people who replied.  I didnt know there were that many monitor-savvy people on expert exchange, I am very grateful for everyone who took the time to give input.  As PCBONEZ supplied the most relevant help and information (not to touch the convergence pots!), I am doubling the points so I can give him the original amount, and spread the rest among you - as a gesture of goodwill for all of your help/concern.

That's very cool of you!
Thank you!

Thank you much.    : )

Glad to hear it was something easy to fix.    : )

Thank you both for your very helpful input and interest.