NEW FLYER IS RECALLING 431 MY 1996-2001 D60HF DIESEL TRANSIT BUSES EQUIPPED WITH A ROOFTOP AIR CONDITIONING EVAPORATOR. THE EVAPORATOR DRAIN LINES MAKE CONTACT WITH COMPONENTS (BALLAST ASSEMBLIES) WITHIN THE INTERIOR LIGHTING PANEL BELOW THE DRAIN LINE PORT. THIS CAN RESULT IN EITHER DAMAGE TO THE DRAIN LINE, WHICH INTRODUCES MOISTURE INTO THE LIGHTING PANEL, OR RESTRICTION OF THE LINE WHICH RESULTS IN A BACK-UP AND OVERFLOW OF MOISTURE THROUGH THE FRESH AIR RETURN VENT AND BACK INTO THE LIGHTING PANEL.