I have had the Apple Pecan Chicken Salad with grilled chicken many times and haven't had any problems.
For the Friendly's on Rte 31 near Great Northern/Rte 481: While not a gluten-free menu, our waitress this morning for brunch was very responsive to my concerns, and the manager assured me of the protocols they had in place for the grill. I had the veggie omelette without toast or potatoes and was able to replace missing items with applesauce without question. Lovely omelette, lovely service! I will be back!