Thanks for the input.
As I mentioned, we'd checked & replaced/swapped bulbs prior since I figured everyone would do that before getting on a forum.
The detailed diagnosis: this WK had no tail lights on left, and no brakes lights at all. Back-up lights & turn signals worked. To confirm bulbs were not the issue, I pulled out the meter and checked all bulbs tonight before proceeding further.
Since I had the assemblies out to check the bulbs, I swapped light assemblies, and got the same results. What tipped me to start checking fuses was the LED 3rd brake light was out also, and I noticed that is powered by the left light plug harness since it has two extra wires the right side does not have.
It turns out the 15amp Brake light fuse and 10amp left tail light fuse under the hood were both blown, and as far as I can tell the left tail light fuse also runs the tag lights, as they magically worked too after a fuse change.. I am glad it wasn't a brake light switch on the pedal or a wiring problem.
Edit - Problem solved for now. I know I was being a bit snippy about the bulbs, but I do thank you all for the replies & suggestions...these community forums make us all smarter about our 'stuff', and you can't tell someone's skill level behind the keyboard.