As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO-FRA, APPROXIMATELY 1.5 HOURS AFTER DEPARTURE, EXPERIENCED AIR FLOW PROBLEMS WITH RIGHT PACK. DUMPED FUEL AND RETURNED TO SFO. *S/D* RT PACK ACM WAS FOUND SEIZED AND WAS REPLACED. AIRCRAFT RETURNED TO REVENUE SERVICE WITH NO FURTHER INCIDENT.