We bought a previously owned house with a Craftsman garage door opener already installed with #132B2171-2 on the keypad. I reprogrammed the number to our own number, but I must have done it incorrectly or accidentally encoded a temporary numer because it doesn't work anymore and we no longer have the previous number. Is there a way to manually reset the number so that we can finally use the keypad again? It would be a relief for it to work again.