Audio Systems: light bulb replacement, light bulbs, 12 volt

Question
I have several light bulbs burnt out on the factory am/fm cd stereo in my 01 silverado. I have accessed the bulbs but in eed to now what type to replace them with and how to perform the replacement. I have attempted gently twist and or pull them from the board without success.They appear to be soldered to circut board. Is this true and if so is it difficult for one to do this themself?

Thanks, Fred.  

Answer
if you take the board apart and put it in a clean table  you can take them out but you need to desoldered them   sometimes they are 12 volt and i seend them also in 6 volts  in that case they put two lights together sometimes radio shack have them in stock  if not any electronic parts shop will carry them  
good luck