Today we went up on the roof of the TC to check and found that something, probably a red squirrel, had chewed through the plastic on the AC cover and made a huge nest inside around the fan blades.
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Fortunately not any of the wiring harness was damaged or even nibbled. One end of one of the fan blades is gone - eaten right off. Up went the shop vacuum, out went the nest, pieces of ADCO, fan blade shreds and lots of leaves. I sprinkled Decon around the bottom of the AC, Gorilla taped the holes in the vent, and put the cover back on. Rest of the roof looked in very good shape though it could stand a good cleaning.
Now we've got to get advice on whether the fan will run okay with an unbalanced fan blade.
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Early next week, we'll load the TC on the truck, bring it over the house and start cleaning and packing it up for the season. All I could think of was the photos RV.NET members have posted of mice nests in their truck wiring. Better the AC unit than the truck!