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First congrats on finding a *working* IFR monitor, this coming from a retired Motorola 2-way tech. All of the FMAM series of IFR monitors are known for weak and often temperamental display sections thus the reason for the plasma used in the COM120.
The monitor section is similar to what was used in the 90's vintage ATM's and POS equipment, the problem is without a service manual or direct knowledge this is going to be one of those seat-of-the-pants repair projects that requires a lot of general electronics experience. That being said I would compare the various voltages between the monitors and use this to narrow down the problem, my money is on a bad pass regulator transistor and some leaky capacitors that are loading things down.
Does yours have the CGA/VGA port on the back for an external monitor? This was an option for them and it might be a better way in the long run
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