If you can do the following statements you can fill out a by mail renewal application at travel.state.gov and avoid the $35 execution fee:
I can submit my most recent passport
I was at least 16 years old when my most recent U.S. passport was issued.
I was issued my most recent U.S. passport less than 15 years ago.
I use the same name on my most recent U.S. passport or I have had my name changed by marriage or court order and can submit proper documentation to reflect my name change.