How to install a garage door key pad and two remotes? I can install/program the pad and can install/program the two remotes but cannot install/program the three so they'll all work. What's up? Remote # is 139.53681 and the keypad # is 139.53876. The door opener is one of the following: 139.536651SRT, 139.53671SRT, 139.53673SRT or 139.53677SRT. Pls help. Thanks. John S.