How can i find the serial number of sup-720 which is totally dead and not boot?By which sticker on SUP and where ? How many digits ?

we purchase only Cisco Supervisor Engine VS-S720-10G and use it in our old C6509-E chassis.Now the supervisor engine was dead,(means not working and no LED's are ON). How can i claim the RMA from cisco?We purchase from one of our partner. We send it ...