As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RAPID DECOMPRESSION, FOUND SPLIT FLEXIBLE COUPLING ON NR 2 PACK AND NR 1 LOOSE FLEX COUPLING. REPLACED SPLIT COUPLING AND TIGHTENED LOOSE ONE AS REQUIRED. NR 2 PACK LEAK CHECKS OK. RAN NR 1 PACK COULD NOT DUPLICATE PACK NR 1 OVHT EICAS MESSAGE.