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The top edge is much darker looking... I assume this is the original finish? It looks like something is either on the rest of the piece making it look awful, or else the material is failing all together and needs to be replaced.
Since it feels sticky, and you say it is supposed to be hard plastic, it sounds like something may have been applied to the trim. Can you test a solvent like mineral spirits on a cotton ball in an inconspicuous area and see if it removes anything from the surface?
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