At 0918 hours the box assignment was dispatched for Panera Bread in East Whiteland Township. East Whiteland crews arrived with smoke in the eating area. Paoli Tower 3 and Malvern Ladder 4 were tasked with going to the roof. Crews found an air handler unit on fire. Crews secured the unit and the incident was scaled down to on-scene units. Crews worked until being released by Car 42.