Yellow Brown and blue are at the air handler.IF, cable 1 goes to compressor... and
there's another cable, cable 2,...
is that where the mystery wires to thermostat are?
Just a guess.
there are yellow brown and blue wires at the thermostat. (brown is just capped off with a black wire). brown wire has the same labeling as the one coming from the air handler. So i'm pretty sure those are all the same wires.
So the only things that don't make sense is
1. where did the extra yellow wire come from at the thermostat
2. where did this orange come from?
3 why are the brown and new black wire capped together?