May not be the right way but one of two ways I know how to look at it would be a sticker saying the modification has been done or get the model and serial # and call Dometic to see if the recal has been preformed on that fridge.
could always call the selling dealer and ask them if it was performed - usually they are supposed to perform any recalls prior to selling a used trailer
2011 Rockwood Mini Lite 2306 - Matt
2004 Dodge Ram 1500 Qaud Cab 4x4 with 35" tires and 3.92 gears, Dynatech Longtube Headers & Fabtech 6" lift + Superchips with shift Tuning
Nights Camped 2011 (37) - 2012 (16)-2013 (2) -2014 (5) -2015(0)
USMC 91 - 95 - F/A-18 Aviation Ordnance