As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- DURING FLIGHT THE CREW NOTED THE PAX VENT POWER SUPPLY CIRCUIT BREAKER POPPED; WHEN THE CIRCUIT BREAKER WAS RESET A STRONG ELECTRIC BURNING SMELL WAS PRESENT. THE CREW PULLED THE CIRCUIT BREAKER AND THE SMELL DISSIPATED. IAH- MAINTENANCE REMOVED AND REPLACED THE PAX VENT FAN, AND PERFORMED AN OPERATIONAL CHECK OF THE FAN WITH NO DEFECTS NOTED. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.