As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/BNA - FLT 7705 - DURING CRUISE, AIRCRAFT MADE AN UNSCHEUDLED LANDING DUE TO 14TH STAGE DUCT FAIL LIGHT ILLUMINATED. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND REMOVED AND REPLACED LT ENGINE 14TH STAGE PYLON DUCT ASSY, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)