Take it off. They may have to replace the top case.
Just peel it carefully from one side of the case. It should come off without leaving a residue. Place it on wax paper and weight it down with something heavy and flat. That should keep the adhesive from drying out.
Be warned that palmgurad will have some funny looking spots on it depending on lighting. This is normal and just stress marks from removing the palmguard (I had this happen to mine when I was putting mine on my MBP and removed it to re-position it).