You didn't mention the high mount (third) brake light.
Is it working?
Did you check the bulb filaments with an ohmmeter or visually?
If only visually, recheck them with an ohmmeter to ensure that there is continuity.
Brake light filaments are pretty thick and sometimes a break in it is not always visible at first.
If it is good check that you get +12V at the light sockets on the red/green wires when the pedal is depressed.
If you do not get +12V at the socket, check the brake light switch.
It is located under the dash, mounted above the brake pedal.
You should get +12V on the red/green at the switch with the pedal depressed, if not replace switch.
If you do, you have an open in the wiring, in which case, you will have to find it or wire around it.