Craftsman Garage Door Opener - remote quit working
My wireless remote quit working for my garage door opener. It is a Liftmaster single button transmitter (61LM). I replaced the battery and the red light on the remote lites up when I push the button, but the garage door doesn't open.
Through searching online I found that I may need to reset my garage door opener's code. I have been looking for the "learn button" (AKA SRT button?) but I can't find it anywhere! I have taken off the case of my opener system and found nothing. The system is a Sears Craftsman 1/2 HP, model 139.53600. I imagine it is pretty old (it was here when I bought the house).
I know little about mechanical endeavors, so any advice is appreciated! Can someone help me find my learn button? Or am I barking up the wrong tree completely?
Thanks in advance-