After an electrical storm (no direct hits taken), the router I setup for my parents at their house quit passing traffic to their wisp.

Today, went to their house, and first thing I noticed that was odd, was that ethernet 1 was training up at 10m *full* duplex, to the wisp's equipment, which is 100M.

Also noticed that even with the ethernet cable unplugged, the LED light still stays lit, and gives the link status of "link ok", and at 10M full.

Now, at this point, I'm %99.999 sure the port's done-for, but, before I replace it, I thought I'd ask if this might happen to be some weird quirk with a simple answer/fix.

thanks in advance

I assume you power cycled the device? Pull power wait ~30 sec plug back in. Be sure and wait. The caps need to drain.

Try other working device to plug once into the port of mikrotik and second time to the isp client. Check what device is broken.

powered the router down for ~2 minutes, powered back on, and ethernet 1 still shows an active 10m full duplex link even without anything plugged into port 1.

I have setup the link to the wisp on ether2, and it works fine.

pretty sure i have a faulty ethernet 1 port at this point.

Try replace AR7241-AH1A.

I appreciate that. As inexpensive as they are though, I think I'll just purchase another, and use this one as a backup. It doesn't seem to be affecting the performance/stability of the router as long as I keep the port disabled.

you can reconfigure router to have another port set as WAN port, so, new purchase is only required if you used all 5 ethernet ports.