tokens: The Storage plan shall include provisions for : 1 . Storage of spare units with the unit being stored to ease failure investigation ; 2 . Storage of test coupons at lower tier suppliers or EEE part suppliers ; 3 . Storage of spares , spare parts or even integrated spare kits ; 4 . All life limited items , as listed in the Critical Item list from DRD of Annex A of ECSS - Q - ST-10 - 04 , together with relevant dispositions .