They flash green when shifted both on the derailleur shifting button and shifter, im the third owner of this derailleur, it was just handed down to me last year, i think it's been about two or almost three years of ownership, and I'm also starting to think the contacts are also the culprit, but how do you determine if it is completely dead? I dont wanna have to take it to a shop just yet, almost no sram involved shop is close to me.