Man, I would love some more info :-)
For example, if the light bulb was in the hallway in front of the elevater, I would flip a switch, call the elevater, reach in press the floor number for the top floor and step out.
After the elevator starts it's accent, pry open the outer doors and look up. Once the elevater doors open, You should be able to look up between the elevator and the side of the shaft.
If I see light, Great! Call the elevator again, and ride up for the money
Otherwise, try a different switch and repeat the process again
I'll have to think about it some more with the given info
IcIshoot