Update:
First, thanks to Bama Rambler: Although I didn't get a precise answer, you did edify and change my way of thinking about the problem, which lead me to the solution. With only 5-year RV experience, I consider myself an RV neophyte. I delayed posting this update until I was confident a solution existed.
I contacted Dexter via email and was quickly replied by
Jaritzia Reyes (
Warranty/Customer Service Coordinator) who was exceptionally helpful: first verifying that my door was indeed theirs, and secondly identifying the door model and color, and that a replacement hinge repair is available. Jaritzia provided the part number and instruction sheet, and put me in contact with
Marty Hosler (
Customer Service Coordinator for Dexter – Door/Vent Division). Marty telephoned me within a day. We completed the order, and I am waiting for its arrival. Part number: 1892-57 for champagne color screen door hinge; price $3.49.
I am very pleased with Dexter's customer service and their care to see this issue resolved. I'll update again after I complete the hinge replacement job.