If you have the original remote and receiver for this opener you will find a set of dip switches inside each one that can be changed to change codes. Whatever you do to one you must duplicate on the other. The remotes and receiver for this unit have been 'no longer available' for a long time. Changing codes doesn't normally make these things start working again.

I have a 1/2 hp garage door opener and I would like to re-program the code, I want to do this as there are a couple of people that have my code I no longer want in my home. Is there anyway for me to do this. All the help would be great. modle no# 139 53975srit1

see above.