I have had to replace many SPS's before and never returned them before.  I think it is becuase it is a battery but i could be wrong. CRU= Customer Replacable Unit = Replaced by you FRU= Field Replacable Unit = Normally means a CE has to come out to replace since it involves special proceedures  And i have never seen a list of what parts have to be sent back.  In the USA,  what i have seen is that if they want a part returned,  they send a return UPS label and a purple sticker to put on outside of box stating the contents are defective.   It might be different for you in Ireland
I am in the process of returning defective hard disks to Ireland, and one of the step to return the parts is to fill a "Field Return Tag form" a put it inside the box of the defective part.  by example  1. disks spares comes with this blank tag ready to fill it with the returned defective parts info. 2. but SPS does not come with this tag.  my questions  1. , do i have to returned the SPS without a a tag, is sure that is a defective part. so i dont need a tag or i dont need to returned that kind of part? 2. what the diferences between CRU and FRU. 3.  is there any list of all types of parts that i have to returned thanks  mc.
returning defective parts to EMC2 Cork Ireland - Question