RT-N16 issue, suspect HW

I have an RT-N16 that worked great for a year, then DHCP quit working on my WAN. I reflashed to stock, Victek, Shibby and Easy Tomato, all work the same, the port shows activity (where applicable) but cannot get an IP. If I use the stock and dual WAN, I can get an IP by using one of the LAN ports.

Anything else I can try before I turn this into a WET?