Actually, there is such a beast, I've got one for my 1438. Mine is made by Micronik, IIRC.
As for the original poster: What happens when you jolt the monitor cable? Does the red go on and off then, or doesn't it do anything? If it doesn't respond to cable handling, the problem might be further inside the monitor.
Since the monitor works otherwise, it's undoubtedly just a bad connection somewhere, and that could be diagnosed with just an ohm-meter. You could ask a TV repairman for a quote, or ask someone who's good at electronics.
