I might come back to the project if I decide to try to repair the old meanwell switcher I have, but I think I know what the problem is, its just a SOB to repair that area of the device (full disassembly), so I will have to fail at least one repair attempt before I embark on this project. Not even sure how it will react, so if I do it, I will just leave a light bulb on a bench to see if its even a valid troubleshooting aid.
The more difficult/annoying something is to disassemble, the more interesting this project is. It would have come in handy for troubleshooting the amplifier I just fixed, but somehow I managed without it.