I have a Sers Craftsman Garage Opener and neither of the two 3-function remote controls will work recently. I replaced the batteries and have tried several times to reprogram them to no avail. I have read many problems on the forum similar to mine except that my Yellow Indicator Light will stay on for a while and not blink at all. The wall button works fine. I have tried rebooting the opener and all different ways of pushing the SRT button. Does anyone have any suggestions? Is is possibly a problem with the mother board? The unit was installed in 1997.