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Is there a replacement for Sears garage door transmitter 139.654031? What is frequency of the unit?

The receiver is model 139.654021.
What Mhz frequency do these units operate on?
What is broken is the push button return/contact spring, are these available?
If so where?

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Building Supplies
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Manage My Life
by Manage My Life
June 24th, 2009
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