We have a wonderful Precor EFX 5.23. It's a great machine, but it has an intermittent knocking sound that is starting to drive us crazy. Here's a video of it. I'm sending the link to the Precor customer service reps to see if they can diagnose the problem with this otherwise 'whisper-quiet' machine.

--update--

The Precor reps set me up with my local service tech. The sound was from the large belt catching an edge then snapping back into the track. One slight adjustment later and the sound stopped! Very cool.

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