Brake light bulb socket question

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2013 Mazda CX-9 Grand Touring Tech Package White
anyone have an idea how to replace the brake light bulb socket on a 2013 CX9? ive been searching everywhere and cant seem to find any videos or information. Hopefully someone can chime in here. my brake lights dont light up anymore and i noticed my socket was corroded, pretty bad. i used a wire brush and some electrical cleaner and it still doesnt work. and yes, i even tried new bulbs. im guessing the socket just needs to be replaced.
 
the clip to replace the harness is behind that small hole. any idea of getting behind there?
 
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