right mirror turn signal

can anyone tell me how to change the bulb if there is one on my drivers side mirror on my 01 navigator. this truck has the turn signals on exterior of the glass and the driver side is not working can anyone please help???????

behind the mirror lens you'll find release latches in each corner to pop the cover off the mirror - however I think on yours the light is built in to this cover without a replacable bulb - good luck with the project