Use the SEARCH function. There are many discussions on replacing light bulbs in the dash buttons. Go to any Honda parts website and you will find the bulbs under Electrical/Switches. To avoid shipping charges, use the Honda eStore through Honda OwnerLink and have the bulbs shipped to your local dealer. The heated switches have three bulbs. One bulb for the button illumination and two for the on indicators. The bulb you are describing is the main button illumination bulb. Just pull the transmission trim panel up with your hand and replace the bulbs.
It's a fairly easy fix (just did mine last week). The bulb costs about $2-4 from the Honda dealer. Just pop the trim off that goes around your shifter, detach the clip from the bottom of the module, unscrew it from the trim piece, use a thin flat screwdriver and unscrew the bulb needed.