As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKE OFF BLEED AIR 2 OFF ALERT. TRIED MANUAL AND 2ND AUTO CHANNEL COULD NOT RESTORE (BLEED AIR 3 PREVIOUSLY DEFERRED) AIR TURNBACK PHNL 90,000 LBS FUEL DUMPED. REPLACED NR 2 PRESSURE REGULATOR PILOT VALVE IAW AMM 36-12-20-4. RAN NR 2 ENG IAW JRH. NR 2 PNEU OP CHKS OK. ACFT OK FOR SVC.