As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) SOON AFTER DEPARTURE, THE ACFT LOST NR 2 PACK. UNABLE TO CONTINUE TO DESTINATION. ACFT LANDED OVERWEIGHT AND EMERGENCY EQUIPMENT WAS CALLED OUT. RT PACK CONTROLLER BITE TEST C/OUT. FOUND FAULTY RT PACK EXHAUST ACTUATOR. RT RAM AIR EXHAUST ACTUATOR REPLACED IAW AMM 21-53-04 PB401.