As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GROUND, AC PACK NOISE FOLLOWED BY SUBSEQUENT PACK SHUT DOWN AND EICAS MESSAGE RT DUCT LEAK. *S/D* FOUND RIGHTHAND HEAT EXCHANGER (P/N 810208-2 ) PRIMARY INLET TORN, INITIAL EXAM REVEALED THAT THE DAMAGE STARTED FROM THE V-NOTCH AREA. THE RT HEAT EXCHANGER WAS REPLACED. UNDER INVESTIGATION BY MANUFACTURER.