brake/turn signal

i have a 2004 trailblazer with no left rear turn/brake lights...reverse light working ok,bulbs are good,fuses are good,i have no power to the socket? what can i look for to fix this problem? please help

Seek help from your dealer... there is a recall

Seek help from your dealer... there is a recall
thank you for that information ,you guys are life savers!