As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AT THE GATE THE RT PACK OVERHEATED AND CAUSED A SMALL AMOUNT OF SMOKE IN THE CABIN. PASSENGERS WERE DEPLANED WITH NO ISSUES VIA THE JETBRIDGE THAT WAS STILL ATTACHED. THE RIGHT HAND PACK WAS TURNED OFF AND RECIRCULATION FANS BROKE UP ANY SMOKE QUICKLY. THE RT PACK WAS DEFERRED AND THE FLIGHT PUSHED WITH A MINIMAL DELAY.