As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOSS OF CABIN PRESSURIZATION CLIMBING THRU 28,000 FEET FOUND DUCTING JUST FWD OF AFT E&E COOLING OVERBOARD VALVE IN AFT PIT DAMAGED. REMOVED AND REPLACED AFT E&E COOLING VALVE AND DUCT REF DMC-B787-A-21-27-48-00A-720A-A PERFORMED CMCF GROUND TEST "PASSED" GROUND TEST PASSED. PRESSURIZED AIRCRAFT ON GROUND TO 3 DELTA P. NO MESSAGES. PRESSURIZED NORMAL.