I have moved into a place that has a keypad entry for the Garage as well as a remote from the house. The keypad says to input previous code to change, but I don't know what the previous code is. I have no manuel either. It is a craftsman 1/2 hp mfg 5/97
model # 139.53673SRT1
serial # 21575C00402
resetting the unit by just pressing the red button above doesn't do it. Help
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