How to replace outside 1/2” screw cover (molding) between 320 tail lights?

After returning from a NuCamp dealership (160 miles one way from home) I discovered worse cracking on the 1/2” trim piece that goes between the left and right tail lights of our 2017, 320 TAB Q.   The dealership inspected potential sources of a slow leak into the rear compartment of our TAB and concluded it was not the tail lights.   They attributed the leak to a cracked glycol reservoir.   They replaced the reservoir and their assessment of the tail lights is they were not the source of the leak.   Time will tell.  

I wonder if this is a generic RV molding that I might purchase and possible instructions on how to remove the old one and attach a new one?  Thank you in advance for any suggestions!  

Edit:  I searched “cracked trim” and that turned up a bunch of posts, but mostly for the larger external molding that goes over the roof and side walls.   I will contact NuCamp.