As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2099, THE CREW REPORTED THAT THE APU BLEED VALVE WAS STUCK OPEN DURING CLIMB. THE ACFT RETURNED TO IAH AND LANDED WITHOUT INCIDENT. MX R&R THE APU BLEED VALVE, OPS TESTED WITH NO DEFECTS. THE ACFT WAS APPROVED FOR RETURN TO SERVICE.