How do you track an electircal short in a bedroom that meets ARC grounding requirements?

I have a one year old house and the lights stopped working in the bedroom. An electrican from the builder came out and said there was a short somewhere on the grounding side. He stated there was a new “ARC” grounding requirement in the last six years that was somewhat like a GFI grounding system. He checked all the switches and plugs on that one circuit in the bedroom as well as the breaker box and could not find where there wires touching causing the short. He stated that in order to find the short he would have to start cutting through walls to inspect wires! Instead he changed the breaker from a ARC type breaker to a non-breaker type and everything worked. My fear is now I have lost ARC feature that I paid for and now do not have it’s protection and do not meeting universal buidling code. The electrician felt it was a redundant ground system and I really didn’t need it. Is it that impossible to track shorts without tearing apart walls for a visual? Don’t you think I should pursue have it being done properly?