At 06:24 Company 15 was dispatched to the Milton Public Library for an AFA. Chief 1502 arrived on scene to find normal conditions from the exterior. Engine 15-2 and Tower 15 arrived and made entry to investigate. Engine 5-2 stood by at the hydrant. Crews found the source of the alarm coming from the elevator room. Units on scene: Chiefs 1502, 1503 Derr, Engine’s 15-2, 5-2, Tower 15, MICU 15, Fire police, and Milton Police Department.