As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON APPROACH, FLIGHT ATTENDANT REPORTED AN ACRID/BURNING RUBBER SMELL TOWARD THE FRONT OF THE CABIN. THEY REPORT IT DISSIPATED AFTER ABOUT 5 MINUTES. UPON OPENING THE CABIN DOOR IT WAS PRESENT AGAIN. MAINTENANCE FOUND THE FORWARD GALLEY COFFEE MAKER TO HAVE A BURNING SMELL WHEN THE WARMER WAS TURNED ON AND REPLACED IT PER AMM 25-35-15. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ODORS NOTED.