As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, GOT A RT DUCT LEAK LIGHT AND ASSOCIATED EICAS MSG AFTER ISOLATION PROCEDURE WAS DONE, LIGHT REMAINED ON AND RT PACK STAYED ON. FOUND RT ISOLATION BYPASS VALVE BROKEN. REPLACED SAME. REPLACED SEALS ON SLIP JOINT OUTBOARD OF RT ISOLATION CHECK VALVE.