My craftsman garage door opener model 139.53978SRT operates fine with the remote transmitter and the fixed door control console but will no longer operate using the outside SECURITY keyless entry keypad model #139.53684. I have replaced the battery, cleaned the contacts, and attempted to reset the passcode with no results. The only reponse is flashing lights on the keypad with no door movement. Can you offer a solution to my problem. Thanks.