I got hold of the right person at the dealership, and he said YES, he would pull everything, blow and clean it out. It would be a one time thing as a courtesy to a long time customer. The latest word from GM is to stop fixing them. I found in my research that this is a problem with certain GM models going back to '93.I took the higher ground and said I would not be a jerk and just take it because it was free. I have this issue well documented all the way up the line with GM. I have a reasonable level of trust with this dealer. Besides, it would be more fun to wait until the algae starts growing and then have them tell me this is normal. It does "wane" in size as in larger and smaller. I think I found the vent and it appears free. Unless you are a detail freak like me, most people would never notice it unless it was in its larger size. It blends in well with the reflector grille. So for the time being, I'll just wait and see.
Respectfully,
BINGO53 :great:
PS: Strolling through parking lots these days, I am seeing this in not only a few GM's here and there, but also in Lincolns with similar headlamp design.
Dealer Service Writer: "These are not the headlights that were on our parent's cars!" (refering to sealed beams) :rofl: