Hi, I have a M301 color which is almost exactly the same as EveMurph's M302 - the biggest difference being the colour of the painting. This colour head never had separate bulbs for the dials, so a blown halogen bulb will also prevent dial illumination. I can also say with certainty that this transformer is a just a transformer (the M301/302 never had a switching power supply) and doesn't even have a built-in fuse (except in the UK plug version), so the most likely culprit is a blown halogen lamp, or possibly an oxidized lamp socket (a common problem on those uncooled enlargers). You can easily do a visual inspection of the lamp's filament to check whether it's broken, or if you have a multimeter you can check the continuity of the filament (its resistance should not exceed a few dozens of ohms at most) and the transformer voltage which should be 12V AC, probably a little more since you are measuring it without a load.
Note that all three parts (bulb, socket and transformer) are pretty standard and can be purchased new.
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