As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1521 CLT-DEN - BURNING SMELL - STRONG ODOR PERMEATED ENTIRE AIRCRAFT FROM TIME GEAR WAS LOWERED UNTIL CLEARED THE RUNWAY. COCKPIT CREW NOTICED ODOR WHICH WAS LATER REPORTED BY FORWARD AND AFT FLIGHT ATTENDANTS. ODOR EVENTUALLY DISSIPATED FOUR MINUTES AFTER TOUCHDOWN. MAINTENANCE TROUBLESHOT TO AFT GALLEY BALLAST. REMOVED AND REPLACED 4R BALLAST.