I'd like to see what you've done here, I tried putting dimmable LED bulbs in place of the incandescent ones, and it would fry the traces on the board every time. After repairing the traces twice I gave up. I was trying to keep the function of the rheostat, but didn't find a solution, thinking that while the wattage is lower on the LED it wouldn't be an issue, but apparently the resistance is far different. Caveat electrical is not my forte.

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1983 W123 300TD US spec Turbo engine, with Euro bumpers and manual climate control, and manual transmission.