Does anyone have an idea as to why my a/c smells like old stinky wood? The unit is less than 2 years old -

we didn't have this problem last year - smells are hard to describe but the best I can say is it smells like old wood, it doesn't smell moldy but I guess it could be. Should I have the ducts cleaned I've always heard that's a total rip off. Help it stinks in here.
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