Good afternoon, In October of last year I took my mid-2015 iMac 27" Retina 5K into Apple's store at the High Cross in Leicester as it kept losing power. They kept it in for testing and it turned out it was the iMac's internal P.S.U causing the issue. As it was out of warranty I paid just under £150 to get it repaired. Six months later and the same thing is happening again; I've booked an appointment for next Monday to see what's what. When I was speaking to the team over in Ireland the call-handler mentioned as it's out of warranty there will probably be fees etc-but surely I must have some consumer rights if it turns out it is the P.S.U that's at fault once more? Thanks in advance.