The Blue Light

Official wording

Keep potentially hazardous foods (PHF) cold at 41°F or below or hot held at 135°F or above. Immediately discontinue storing PHF at room temperature., 113984(d), 114097, 114099.1, 114099.4, 114099.6, 114101(b, c, d), 114105, 114109, 114111, 114113, 11415 (a, b, D), 114117, 114125(b), 114141 - Properly wash, rinse and sanitize all food contact surfaces. Make a 100 ppm bleach sanitizing solution or a 200 ppm quaternary ammonia solution for the third compartment., 114123, 114197, 114328(o) - Eliminate sewage backflow into the facility. Clean and sanitize all areas contaminated with sewage with a bleach solution (1 cup bleach per 9 cups water).Hire a licensed plumbing contractor if necessary. All contaminated food items must be discarded. All items that cannot be properly sanitized must be discarded.

In plain English

Food was not kept cold enough, hot enough, cooled fast enough, or cooked or reheated to the right temperature. Bacteria grow quickly in the "danger zone" between 41°F and 135°F, which makes this one of the most important food-safety checks.