Precor TRM 425 Owner's Manual page 12

The equipment serial number is located at the lower
front edge of the treadmill cover, near the power
switch and cord.
Figure 1: Treadmill serial number label position
Important Safety Instructions
The console serial number is located inside the audio
connector compartment on the back of the console.
You will need to open the cover of this compartment to
see the number.
Figure 2: Console serial number label position
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