Network adapter on my Flex 6400 may have failed

It looks like the network adapter on my Flex 6400 may have failed. Here’s what I’ve tried so far:

• Swapped network cables, but my Flex 6400 does not appear in the list of attached devices on my router. No network lights are blinking for that connection on the router.
• Connected the radio directly to my computer, but the computer did not detect it, and there were no network activity lights on my computer.
• Checked for any indicator lights on the Flex 6400 itself but don’t see any blinking near the network port. Does the radio have any network status LEDs?
• Performed a hard reset (holding the button until the light turns white, then releasing). The radio boots up with a steady green light and no error indications.

I haven’t opened the radio yet, but is the network adapter a separate card that plugs into another board?

I’ve submitted a support ticket to Flex and understand they’re busy. In the meantime, is there anything else I can try to further diagnose or possibly resolve the issue?