As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INCIDENT DETAILS: SHORTLY AFTER TAKEOFF, WHEN THE AIR CONDITIONING WAS SELECTED ON A STRONG DIRTY SOCK ODOR WAS NOTED IN THE FLIGHT DECK AND CABIN. THE ODOR DISSIPATED BY THE TIME THE FLIGHT REACHED CRUISE ALTITUDE BUT CAME BACK WHEN THE FLIGHT BEGAN ITS DESCENT. CARRIED OUT EXTENSIVE WORK DONE ON PACKS 1 AND 2. ENGINE 1 AND 2 REPLACED IAW J/C 9-371A. NO ODOR NOTED.