I have not noticed anything on my 2016 2810. You may want to check it out and see if a mud dabber bee built a nest on it. I've heard of people creating screens from 1/8 hardware cloth (think thin metal weave) to line their ax housings. I have screens on everything except the ac.
2016 Passport GT 2810BHS, 2016 F350 CC DRW
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Tom
2019 Alpine 3651RL
2016 F350 CC DRW
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