If you clear all the mic inputs and it still scans, Open a HELPDESK ticket.
Good luck and 73,
Greg - K5GJ
I believe this has been reported previously and is caused by plugging the microphone Foster plug (8-pin) into the front jack 180 degrees out of rotation. It has been reported that Heil branded Foster plugs are slightly smaller in diameter and can be plugged in incorrectly, causing the up/down action to be activated.
See this previous thread:
Greg - N8GD