Check for water in the light housing. It causes a failure that keeps the led illuminated, fix is replace the lens/lamp assembly and be sure to use a new gasket after cleaning the body of all old gasket residue.
Do a web search for the light assy, they are relatively inexpensive and will guarantee you do not install the same problem again.

The left side failed on my 07 4.8l this last year. A little water did a lot of fouling of the logic circuit in the light housing.

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