As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORF - FLT 4971 - CREW REPORTED DURING CLIMB-OUT OF BOS, AN EXHAUST SMELL WAS NOTED IN FLIGHT COMPARTMENT AND IN CABIN. AIRCRAFT WAS LANDED IN ORF WITH NO FURTHER INCIDENTS REPORTED. MAINTENANCE REMOVED AND REPLACED THE APU BLEED VAVLE. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)