377.106 is a post fuser jam (near the exit)
377.900 is also a jam but I am not certain where.
I figure if you are posting here, there is no current jam you can find, which would imply the printer thinks there is one, but there isn't, which would mean a sensor is faulted (possible) or dirty (likely).
Your best bet is to look online for a "Phaser 6700 Service Manual" to guide you through finding the paper path sensors.
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Joe Arseneau
