The refer is manufactured by Dometic. Contact your local dealer or Dometic directly to see where you can get a new one. It would be especially helpful to know the model number (RM ####), and if you call Dometic, they will probably want the serial # and all the info off the sticker inside the door.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR