I have 2 msi r9 270x 4gb, and a while ago one of the fans on the bottom card stopped spinning , so I requested an rma from overclockers , but then after the weekend it started spinning again, so I never bothered , but now it's stopped again so I want to send it back , was about a month ago on the original rma, can I still use that one or do I need to request a new one ??