That link is good, but there is something flaky about the site, Often you need to try it several times.
But here is a another link.
http://www.liftmaster.com/consumerweb/service/faq/faqlanding.htm
Chamberlain make the Sears, Chamberlain, Liftmaster units and they all work the same.
"it's a Craftsman 1/2 HP"
That is not a model number.
The model number will be in the form of 139.5xxxx |
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