'U.S., Canada Discussing Possible Reduction In Us Autos To 15% After Some Value Content Deductions From 25% Currently; U.S. Officials Offer To Deduct Only U.S.-Specific Value Content From 15% Tariffs On Canadian Vehicles, But Canadian Officials Want All North American Content Deducted; Some North American Auto Industry Officials View Either Option As An Improvement Over Current 25% U.S. Tariff On Canadian Vehicles, As Japan, South Korea And EU Have 15% Autos Tariff Rate, Sources Say'