As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX 1245 LOCAL TIME, WHEN RT "DUCT LEAK" LIGHT ILLUMINATED. CREW SECURED THE RT ENGINE BLEED VALVE AND RT AC PACK, WAITED THREE MINUTES FOR COOL DOWN AND ANNUNCIATOR TO EXTINGUISH. "DUCT LEAK" LIGHT DID NOT EXTINGUISH. CREW SECURED RT ENGINE IN FLIGHT AND RTB DECLARING AN EMERGENCY. POINT MAINTENANCE TROUBLESHOT SYSTEM AND FOUND MULTIPLE LEAKS IN THE RT AC PACK ASSY. REPLACED TORN DUCT (PN MGR69766-150) AND WORN CLAMP (PN 744257C2). MAINTENANCE PERFORMED A THIRTY MINUTE GROUND RUN WITH NO DEFECTS NOTED.