How do you change license plate bulbs on 04 Cadillac DHS?

As you look at the clear plastic lens on the lamp assembly there is a small release tab on the left side of each light. Slide a small blade screwdriver under the gray trim piece to release the tab, being careful not to break the trim. with another screwdriver carefully pry the assembly downward after the clip is released. The lens & socket will drop out. Replace the lamp (#PC168) and snap the assembly back into place. I have a 2004 Sedan Deville which is a lesser version than the DHS but same body. Don K.