A large share of the repairs we are called to started small: lint packed into a dryer duct, a dishwasher filter that had never been lifted out, a front-load door boot holding water, refrigerator condenser coils under a blanket of dust, or an ice maker furred up with scale. None of those are dramatic on their own, and all of them shorten the life of the appliance.
A maintenance visit works through those points and shows you which ones you can keep on top of yourself. Dryer venting is treated as a safety item rather than a performance one, because restricted ducting is a genuine fire risk. Where we find something already failing, you get the finding and the price before any repair work starts.