As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT AFTER TAKEOFF A STRONG BURNING SMELL ORIGINATED NEAR FWD ACFT. SMELL STARTED NEAR FRONT 1L DOOR & MOVED THRU CABIN TO REAR. COCKPIT COULD ALSO SMELL IT. ODOR LASTED FOR ABOUT A MINUTE THEN SLOWLY DISSIPATED. THE CAPTAIN RETURNED TO CLT & LANDED UNEVENTFULLY. R & R THE TRIM AIR VLV.