As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT T/O BRING RT PACK ON, TURNED NR 3 BLD ON AND RT PACK ON. AFT COMING ON A LOUD BOOMING NOISE HEARD AND MOMENTARY PRESS SPIKE IN CABIN. *S/D* REMOVED AND REPLACED NR 3 ENG BLEED AIR SHUTOFF VALVE. REMOVED AND REPLACED NR 3 ENG HIGH PRESS MODULATING AND SHUTOFF VALVE REF 72-727-100 MM 36-10-001 & 36-112-0414.