As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTB..ON TAXI RT PACK INOP. RT DUCT LEAK EICAS MSG. FOUND RT HEAT EXCHANGER CRACKED LEAKING HOT AIR AND PRIMARY ALSO DAMAGED. DUE CREW DUTY TIME FLT CXLD. REPLACED RT HEAT EXCHANGER ASSY WITH PART SHIPPED FROM ATL. LEAK AND OPS CK OK. ETOPS CATEGORY 'E': PROBLEMS WITH SYSTEMS CRITICAL TO ETOPS