CERTAIN 2002-2006 MY BLUE BIRD ALL AMERICAN SCHOOL AND TRANSIT BUSES, CONVENTIONAL SCHOOL BUSES, AND COMMERCIAL SERIES TRANSIT BUSES MANUFACTURED BETWEEN DECEMBER 21, 2002, AND FEBRUARY 24, 2005. THESE BUSES ARE EQUIPPED WITH WEBASTO COOLANT HEATERS, MODEL DBW 2010, ASSEMBLED WITH WEBASTO BURNER TUBES, P/N 303046/26533A MANUFACTURED BETWEEN NOVEMBER 2002 AND FEBRUARY 2005. THE STAINLESS STEEL BURNER TUBE IS MADE OUT OF A MATERIAL THAT IS NOT TO SPECIFICATION AND COULD FAIL PREMATURELY.