As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2875 THE FLIGHT ATTENDANT REPORTED A BURNING SMELL WHEN THE HEATER WAS ON. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE INSPECTED THE AIRCRAFT AND OPERATIONALLY TESTED BOTH PACKS WITH NO DEFECTS NOTED. THE AIRCRAFT WAS SUBSEQUENTLY APPROVED FOR RETURN TO SERVICE.