As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LT AND RT PACK HI PRESS. MESSAGE ON T/O, CHECKLIST COMPLETED. LT PACK CAME BACK MOMENTARILY. BOTH PACKS U/S WITH HIGH PRESS. MSG. LT AND RT PRESSURE REGULATOR VALVES REPLACED, BOTH PACKS OPERATED AT T/O POWER, NO FAULT FOUND. CONS.SERV.