440hz

My warning indicators vary in intensity, leading me to believe that there are at least two lamps per warning indicator (some of which are burnt-out). I have read previous postings regarding dirty prisms affecting the intensity of the light transmitted to the in dash warning indicators and I do not believe that is the issue I'm dealing with. I presume that warning indicators would be of a relatively uniform intensity if the issue was solely attributable to dirty prisms.

Question 1: Are the in dash warning indicators lit by more than one lamp?

Question 2: How difficult is it for a mechanically inclined novice to replace burnt-out lamps?

Question 3: How much should it cost to have a MBZ mechanic replace the lamps?