As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2123 THE CREW REPORTED THE NR 1 PFD HAS A BURNING SMELL AND IS POPPING THE CIRCUIT BREAKER. MAINTENANCE REMOVED AND REPLACED THE PFD, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.