As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKOFF ROLL HAD LOUD BANG MID CABIN AREA. RETURNED TO GATE, FOUND RUPTURED NR 3 ENGINE PNEUMATIC DUCT AT RT MID FUSELAGE AFT OF GALLEY SERVICE DOOR. REPLACED DUCT AND AS A PRECAUTION, REPLACED NR 3 OVERPRESSURE SHUTOFF VLV AND ENGINE ISOLATION VLV. OPERATION NORMAL.