As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT ATTENDANTS REPORTED SMOKE/HAZE AND SMOKEY ODOR IN CABIN WHILE AT CRUISE. THE QRH PROCEDURE FOR SMOKE IN CABIN WAS COMPLETED AND THE GALLEY AND VIDEO EQUIPMENT CIRCUITS WERE DEACTIVATED. THE HAZE CEASED, BUT THE ODOR REMAINED. THE AIRCRAFT LANDED AT ITS SCHEDULED STATION IN IAH WITHOUT INCIDENT. MAINTENANCE FOUND THE INTERPHONE AUDIO ACCESSORY UNIT AT FAULT. THE UNIT HAD A BURNED AMP CARD. THE AUDIO ACCESSORY UNIT WAS REPLACED IAW MM 23-42-01. OPERATIONAL CHECKS WERE GOOD.