As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - AFTER ENGINE SHUTDOWN ON TAXI TO GATE THE CREW REPORTED A FUEL SMELL IN THE CABIN AFTER APU START. MAINTENANCE DRAINED THE APU EPA TANK, OPERATIONALLY CHECKED THE APU WITH NO DEFECTS NOTED, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.