Incandescent bulbs can't get 'weak'. They're either fully bright (as bright as they can be) or they're fried. There is no degradation over their lifetime. Mine are dimmer, too, but then you're supposed to know which button is which, so you don't look down! It'* possible there'* a brighter bulb available, or you could adapt LED'* to the sockets, but I don't remember what they were the last time I had it apart. You'd have to pull yours to find out.

Oh yeah, I know that incandescent bulbs don't get weak (I'm an electrical engineering major - if I didn't know that then I've got some issues to take care of), but I was thinking maybe one or more of the bulbs burned out, but I wasn't sure how the illumination of the buttons was set up, say if each button had its own bulb, or if there was some distribution system that utilized only one or two bulbs that sent light out to all the buttons, or if there were no bulbs in the steering wheel and they routed a fiber optic line from the dash...etc. Ah well, I guess it'll be my own learning experience when the time comes to rip that puppy out.

I believe there is one bulb for each button. I think they are permanently attached to the button assembly. The good news is if you replace the switches, the bulbs come out together with the assembly because they are all part of the same assembly.