I have replaced the original equipment with Chamberlin opener, both chain and belt drives, belt is quieter. These were DIY installs, fairly easy, second person makes it much easier. With a little planning I was able to reuse the mount above the door, and the original angle brackets mounted to the ceiling, just needed a few cuts to the other original pieces for the new unit to fit. I was also able to reuse to existing wiring between the sensors and the original opener, just be sure to record the new color codes.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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