As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGERS AND FLIGHT ATTENDANT'S REPORTED A WHIFF OF ELECTRICAL ODOR IN THE CABIN AT A ZONE, B ZONE, AND IN AFT CABIN NEAR ROW 25 WHILE EN ROUTE TO IAH. THE ODOR RETURNED LATER WITH A VISIBLE HAZE. THE APPROPRIATE CHECKLIST WAS RUN AND THE ODOR AND HAZE CEASED. THE AIRCRAFT LANDED AT IAH WITHOUT FURTHER PROBLEM. MAINTENANCE FOUND THE OEU (OVERHEAD ELECTRONICS UNIT) AT L-3 DOOR SHORTED. THE OEU WAS REMOVED AND REPLACED, OPERATIONAL CHECKS WERE GOOD.