Pretty easy fix, the lights are more or less accessible on these : they are on a long but not wide little pcb on the backside of the "white box" behind the screen, the pcb clips out (pretty fragile though), and the bulbs are well marked, you can get the rubber tubes off them (they look like glass fuses) and slip them over a white or amber led (+added resistor) and to stick to original these kind of bulbs are still available if you would like to switch them out. There are not soldered but clipped in, just like glass fuses. I loooooveeeeee my 55 (but its screen slowly went totally dead, segment by segment
) so I sortof made a "screen" myself. Really hate how the circuit strips (the big white strips around the "white box" often dont age well and cant be repaired
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