As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE CREW RECEIVED A REAR BAY OVERHEAT ANNUNCIATOR. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT WAS RETURNED TO KIAD. A NORMAL LANDING WAS MADE AND ENGINES WERE SHUT DOWN ON THE TAXIWAY. MAINTENANCE REPLACED THE RIGHT ENGINE BLEED AIR DUCT. ENGINE GROUND RUNS WERE PERFORMED AND LEAK CHECKS WERE GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.