replacing l.e.d liftgate brake light.

I have a 2002 Olds Bravada. The rear l.e.d. liftgage brakelight located just above the rear glass is only half lit. Can this l.e.d. liftgate brake light be changed via do-it yourself. The GM dealer wants $170 for
the part and another $150 to change. Can this light be picked up as an aftermarket part? Any stores in Canada anybody knows about?

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