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If I had a dollar for every time I heard that...

After thinking about this more, I began wondering... In the TSB, it specifically mentions people trying to get warranty on aftermarket headlight assemblies THAT HAD MOISTURE IN THEM. Either GM buys their assemblies from the same place as the aftermarket companies do (quite possibly) or EVERYONE, with these style of assemblies is having the exact same problem. Hhhmmmm...

There does seem to be an issue with headlight assemblies. The housings are not "completely" sealed. Yes, you can replace the high and low beam bulbs (unless you have the HID's, looks like you don't). They would need to replace the entire assembly if a part or all of the LED running lights burn out. That said- Remove the bulbs from the housings and park it in the hot sun somewhere (or use a blow dryer) to let the moisture escape and dry the housing out. When you go to remove the bulbs, you will first have to remove a cap, with a 1/4 twist. The cap has an o-ring on it, make sure it's intact, no nicks or tears. This is what SHOULD be keeping moisture out, ha! This happened on my wife's Camry. Actually, no visible moisture but over time the projector lense developed a haze. The only cure was to replace the complete housing assemblies (on my dime, warranty was up). Ours will probably develop a haze as well. Let's hope to nail this down soon... (On some forums, some were actually separating the Camry headlight assemblies by cooking them in the oven, at low temps, for a few minutes, to clean the lense. I tried it on the old headlights after I swapped them for new, it was a huge mess with the sealant and stuff.)

Yep, noticed that but, I found it much easier with just a blade. And less messy.

I haven't done this yet but if it's like my jeep, it will cut easier if you take a heat gun (or hair dryer) to it, just ahead of your razor blade.

The flat spot on the LED corresponds to the silver band on the diode

I didn't have a spare diode laying around that would fit, mine had some fat leads on it. So, I used an LED, now I have a soft green glow at my knees when my fogs and high beams are on.

I just did this mod on my new-to-me 2016 Yukon. For the life of me, I could not get the fat lead of my 3a rectifying diode (I had some already) in deep enough. I did not want to have to run to the nearly dead-and-deserted radio shack in town so, I just used an LED that I had laying around. Now I have a small green idiot light at my left knee when the high beams are on, along with my fogs. It is a subtle light, but handy, actually. The flat spot on the LED corresponds to the silver band on the diodes. Flat spot to the high beam wire.