Dash Lights Out...
I have had the same issue with my 2000 SLE - dimmed and/or just plain 'burned out' LED'*. Upon IP disassembly, I have found that the backlight lamps are not LEDs but regular incandescents! (That is why they dim - LED'* cant dim well or smoothly) You can find the replacements at Radio Shack - but can be hard to find, as they may carry only 2 to 3 packages of them. Another factor I found was that the bulbs were not burned out at all - just the soldering to the printed circuit has a small break that has been created over time (temperature expansions, age, etc). This type of electronic circuitry is typically manufactured by first installing all of the components then the assembly passes through a "solder blower" - which basically blows the powdered solder onto the preheated assembly, making the connections. This type of manufacturing process can leave tiny flaws that give rise to the problems you are having. A simple solution that MAY fix the problem is to take the IP out, remove as much plastic as you can (pretty easy, just make sure you keep the needles' positions match-marked) and then set a heat gun (not a hair dryer) on LOW and carefully pass it over the circuit board a few times - try to get it to about 200-300 degrees F which should be OK. Reassemble the IP just enough to put it back in the dash and test. Try remaining areas still burned out once more and re-test again. Second failures should be replaced. Reassemble IP completely, install into and reassemble dash. This procedure also works with other backlit assemblies and buttons (wheel controls, etc), however radio lights are a different story - more on that in an upcoming post.
Hope this helps!