As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DFW-ICN, AIR RETURNING TO DFW FOR PACK R MESSAGE AMBER AT TOP OF CLIMB. RESET WAS ATTEMPTED WITH NO HELP. EMERGENCY DECLARED. FOUND RIGHT COMPRESSOR OUTLET DUCT DISCONNECTED. RECONNECTED RIGHT COMPRESSOR OUTLET DUCT, CHECKED IAW DMC-B787-A-21-50-F2-69A-421A-A.