I have read several posts and dont think I found my exact problem. The two remotes (handheld) for my sears craftsman GDO do not function. I have changed batteries, and re-learned codes. No luck. The Keyless exterior control DOES work however, as well as the hard-wired door control. I have read that sometimes the circuit board goes bad. If that were the case, why does the "keyless" work. Doesnt that rely on the same technology?