Plumber Broke A Wire Doing Repairs, Can I Charge Them for Electrical Work?
First off....WOW! Two grand to troubleshoot and repair a broken wire? That's sounds waaay high. That should cover a Journeyman electrician for a week. I think they based their price on the value of your home.

Second, if everything was working fine prior to the plumbers visit I would definitely ask for a back charge from your HOA.

Good luck!