You have to remove and dismantle each switche and solder in a new bulb on the inernal printed curcuit board ... time consuming and tediously precise work ... the bulbs are 14 volt 0.065 amp minature ... part number is 8111 (you need the ones with wire leads) and are available on eBay at US $1.00 each (search 8111 bulb) ... in my 04 LeSabre there were some 35 such bulbs throughout the all of the switches and buttons! By the way, if you ran the dash lights at half brightness the bulbs last a lot longer, even 2 volts less (than the rated 14 volts) extends the life more than 3x. Best wishes with the replacement!
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