As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS AN ORIGINATOR AND WHILE IT WAS ON THE GATE THE RT PACK FAILED AND THE CABIN FILLED WITH SMOKE. NO PASSENGERS WERE ONBOARD. MAINTENANCE VISUALLY INSPECTED A/C NO EVIDENCE OF FIRE. DEFERRED CABIN TEMP CONTROL SYSTEM AND RT AIRCONDITIONING PACK MX REMOVED AND REPLACED RH ACM. OPS CHECKS GOOD.