I have picked up a PVM 20N5A for next to nothing. It is a great monitor that is lacking RGB. The service manual covers the models that do. It's very easy to obtain. I have the necessary experience to work on this equipment. I would like to mod it to the next model up, which has RGB! All that is missing off my model is the button for RGB, the BNC connectors and associated input circuitry. I could prototype this stuff on a perfboard and fit the BNC connectors quite easily. Looking in the service manual I see the component differences are very minimal, and the jungle IC seems to have some MODEL inputs and associated resistors to select the model. Rather than come up some circuitry to inject the RGB into the jungle IC, modding the components in such a way seems to be a real winner here. Perhaps most of the RGB components for the input card are already installed, minus the BNC connectors. The only bad thing I could see happening is perhaps the EEPROM might have some model number stored in it and it may get a bit upset with these changes. Any thoughts?