Sorry I didn't see this in time last night, Arline! Hope they turned out well! My advice would have been to leave them where they were. As for the test for doneness - I guess the "break" means pull back from the bone? I'm just not familiar with that. What I do, as learned from pit master Old Sarge, is use a wooden toothpick! When you stick it in the meat between the bones, you feel how easy it goes in. If you can pull the meat sideways a little, away from the bone, without breaking the high-tech "rib tenderness sensor," they're done!
If they feel tough, when you pull sideways, leave them for another 30 minutes and check again. Works every time, like a charm! I've never had a tough rib yet, using this scientific approach.