As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKEOFF SMOKE BEGAN FILLING UP IN THE BACK GALLEY AND STARTED MOVING FORWARD. IT WAS AN ELECTRICAL SMELL. AIRCRAFT AIR INTERRUPTED BACK TO ORD. EMERGENCY WAS DECLARED. AFTER LANDING THE SMOKE WENT AWAY, BUT THE SMELL STAYED. PERFORMED SOF CARD AND TROUBLESHOT. NO FAULTS FOUND.