As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2594 - EWR - FLIGHT CREW REPORTED BURNING SMELL IN CABIN AFTER DOOR CLOSED FOR PUSHBACK. F/A WAS USING PA WHEN SHE NOTICED THE BURNING SMELL. EWR MX RUN PACKS FOR 30 MIN WHILE OPERATING BOTH FWD AND REAR PA'S, NO BURNING SMELL WAS NOTICED. ACFT WAS APPROVED TO RETURN TO SERVICE.