--Replaced broken Teensy with new device--working normally.
--Replaced broken DC-DC adapter with new one--added insulation, better connectors, wire strain relief, and support padding to the bottom of auxiliary circuit boards.  Seems to be working fine now.
--Replaced broken USB Wifi adapter with new one.  Had to change /etc/udev/rules.d/70-persistent-net.rules to remove old wlan1 (and unused wlan2) and replace it with new wlan1 since devices are given the 'wlan*' names based on MAC address.  Rebooted and network is back to working normally.