I just changed the shifter bulb in my 1999 626.
Gently pry out rubber grommet between top of shifter box and top plastic panel. Top (flat) panel can be pryed off also, but, be careful with this one. Use a thin flat screwdriver and start at bottom end (nearest seats). It is held by spring clips and/or plastic tangs. The shifter gear indicator decal (the lamp is underneath) is held in by, yup, plastic clips. Four clips, two on each side. You have to pop the clips off from below, use a "hook" shape wire from above or flat from below. There you are.
Change bulb, TEST, clean area (because you are there)
Good luck