Food Safety Report: Firehouse Subs Concord Parkway, 28 Raiford Dr NW, Concord, NC 28027, USA 11 months ago • details Comments Comment Suspected food poisoning. Symptoms: Diarrhea, Nausea, Vomiting, Stomach Pain, Cramps Suspected source: Engineer sub Onset: 4 to 12 hours Duration: 12 to 24 hours Additional information: Yesterday at lunch, I… See more