As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THERE WAS A BURNING SMELL IN THE COCKPIT (NO SMOKE NOTED) WITH A SLIGHT HAZE IN THE CABIN WHILE BOARDING. THE EVENT LASTED BETWEEN 5 TO 10 MINUTES AND THERE WAS NO MEDICAL ATTENTION REQUIRED. / REMOVED AND REPLACED RH ACM IAW AMM 21-51-08-000-4000-801-A01. PERFORMED OP TEST AND LEAK CHECK OF THE RH PACK IAW AMM 21-51-00-710/790-801-A01. OPS CHECK GOOD AT THIS TIME.