As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN REACHING FL330 , THE CABIN ALTITUDE LIGHT CAME NI AND THE RT PACK INOP LIGHT CAME N. WE STARTED DESCENT, THE CABIN STABILIZED AT FL 250. THE RT PACK WAS RESETTED AND FOUND OK. THE CREW STAYED AT THAT LEVEL FOR THE REMAINDER OF THE FLIGHT . MAINTENANCE FOUND A COUPLING /CLAMP ON THE PRECOOLER LINE LOOSE THE COUPLING / CLAMP WAS RESECURED & LEAK CHECKED SERVICEABLE.