Why does the 4050 80 no longer meet building codes?

Cool! That’s very interesting that the had a 4208AX! But where would I get a diode and what would I get what’s the name ohms volts reseistense etc.? also my bulb is burned out. Where would I get a 24VDC bulb? i think it’s a screw in type. It’s defenatly a 24VDC unit thus the model number a 4050-80. Any info on the diode and a picture of a wiring diagram would be greatly appreciated! As I’ve said I’ve never dealer with this type of light plate.
Mr.Truealert