As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- FLIGHT 3953 STRONG FUEL ODOR OBSERVED AFTER APU START, WHILE ON ENGINE BLEED SOURCE. IAH- MAINTENANCE INSPECTED THE AIRCRAFT AND THE AIRCRAFT WAS RELEASED IAW MEL. MAINTENANCE REMOVED AND REPLACED THE APU, PERFORMED AN OPERATIONAL CHECK OF THE APU. NO DEFECTS NOTED AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.