As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6700 - IAD-BNA - DURING CRUISE, AIRCRAFT MADE AN UNSCHEDULED LANDING DUE TO 10 TH STAGE BLEED AIR SHOWS PSI WITH VALVE CLOSE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND GROUND RAN AIRCRAFT AND COULD NOT DUPLICATE PROBLEM, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)