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Some otherprocedures require special attention. The WARNING! symbol means that ifyou are not careful, You could injure or kill yourself, or You could damageequipment or property. The ATTENTION! symbol means you should pay special attention to: Important instructions for using the system, or Important instructions for maintaining the system. The Class II Symbol alerts qualified service personnel to use only identical replacement parts in this apparatus. FOR YOUR SAFETY Do not try to open thecase