Old garage door opener...need a new remote/receiver

["Dav" <xlfiles@xxxxxxxxx>]

I need to find a way to replace my remote since it has stopped working.
The garage door opener is so old that i can't find the same brand
remote. I have purchased two universal remotes, one didn't work, the
second one (outside keypad) worked for 1 month.

Is there a way I can build a remote/receiver to switch the door opener.
I just need to find something that will work for more than few weeks.

Thanks
David