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If a new bulb does not work, then it is most likely something else, perhaps the wiring or a connection. You can probably have your machine serviced to get it fixed, or go purchase a light that you can place close to your machine to light the sewing area. There are lights available with attachment clips and a bendable neck that well let you get the light in the right spot. There are also strings of LED lights available on eBay that you can attach to the upper part of the throat to light the work area. I replaced my regular sewing machine bulb with an LED bulb and was surprised how much better it lights.
The typical rebuild on this board is done by replacing the 22 micor farrad caps. There are 3 or 5 of them depending if it is new or old style. Note: the power to the sew lamp goes straight from the motor to the lamp, the power to the control panel goes from the motor to the main board (base plate) then to the control panel. If you get the LED's on occasion then it is not the transformer or fuses in the base plate but simply the caps. Sometimes you can just scrape off the electrolytic gel that has oozed out of the caps off of their teminals, but replacing them is the best. A Pfaff dealer can get a core credit for your board if you take it in. You shouldn't have to pay more than $200-$300 for a rebuilt base plate.