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The strip on the trunk is on a different circuit then the ones on the sides. This indicates there is an issue with the wiring for the switch and the power to it. Since you replaced the fuse already with no success it sounds like it may be the GEM module. This stands for generic electric module. If this is bad you can expect a ballpark of $400-$500 to replace and reprogram the GEM.
Don't hold me to it :) it is a ballpark estimate and hopefully they will find something less major to be the issue.