Sears garage door remote problem
I have a craftsman 1/2 hp door opener (model #139.53674SRT2) about 6 years old and one of the remotes stopped working. I changed the battery and when I press the button on the remote, the red light flashes on the opener so I know that it's getting a signal. I've tried the instructions listed in the manual to 'add a remote' by pressing and holding the remote button while pressing the 'SRT' button on the opener and then releasing but it still did not work. The other remote still works. Any suggestions?