What is your opener not doing and what make is it? I have seen several MVP models where the sensor connections are corroded the door will not close. Look at the sensors for a RED light. Also, these have RED and Green lights at the back of the unit. If these are ON or flashing this is an error code, the codes are in the manual, or I have a copy of these, and can look it up for you.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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