JerryC, you should also tell your neighbor to clear ALL of the codes in their garage door opener (not the remote) for all of the garage doors, and then reprogram when they return. There was a rumor (urban legend?) that there was a 'contractors' code that would allow the contractors to gain access when the houses were being built, and if not cleared out, allows access to any remote with that code.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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