This recently happened to our 2017 Columbus 340RK. Dealer/service manager didn't bother to contact FR/Columbus but contacted the door manufacturer (Lippert) directly and in a few weeks a new hinge was delivered. There is a sticker on the door with numbers, ect. that our service manager gave Lippert.
Hope this helps.
2017 Columbus 340RK
GMC Sierra 3500HD Z71 6.6L Duramax/Allison