It may be something to do with the age of the bulbs that are currently in there and what the LCM is seeing as far as power draw that is causing your issues. You can pop the covers off the light housings easily enough to check for corrosion but I HIGHLY doubt you would get any there.

In all honesty, I'd just code off cold monitoring and install some LED replacements...IF the error comes back I'd worry about it at that point.

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