After health officials linked a San Luis Obispo County pumpkin farm to an E. coli outbreak that resulted in five confirmed cases and three children in intensive care, the farm’s owners are still trying to get to the bottom of what went wrong. “I’m destroyed,” Brookshire Farms co-owner Shawn Callaway said on Friday — the first day the farm was open to the public after shutting down for 10 days during peak pumpkin season.