Hallo! One of the insulated sidelights in our fiberglass front doorset has failed--the black seal around the frame in between the two layers of glass has pulled away from the frame and is now visible. The windows have never fogged but it looks horrible. We're getting ready to sell our house and would prefer to repair than have to purchase and install an entire new doorset since the door and the other sidelight are just fine.

I can see there are plugs where there must be screws or fasteners holding the fiberglass molding to the door. Having repaired half a dozen wooden windows myself I think we could tackle this--but my husband is afraid to touch it.

Any suggestions? Brand of door is unknown but most likely installed by the previous owner just before my husband bought the house 10 years ago; most likely the door came from the local big box store.