I have heard people say that universal remotes will work, but have never seen one actually work, so be sure you can return whatever you buy. There are 5 pushbutton remotes for sale on this site, very reasonable so if that works for you great. There is also an entire motor unit for sale.
If none of these are of interest or work, I suggest replacing with Chamberline garage door opener, they have several models from basic to Wi-Fi, battery backup and belt drive. With care (and maybe some guidance) these are DIY projects, 2 person makes it much easier, and I have been able to reuse some of the existing mounting hardware which cuts down the installation time.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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