As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTS AT ALTITUDE THEY HAD PRESSURIZATION FLUCTUATIONS, TROUBLESHOOTING OF THE PRESSURIZATION SYSTEM IAW AMM 36-10-00 HAS SHOWN BLEED LEAKS IN THE REAR DISTRIBUTION SYS TO BE AT FAULT. ALL REAR BLEED AIR DISTRIBUTION PIPES RE-CLAMPED, TORQUED AND LEAK CHECKED. ACFT GROUND RUN AND OPS CHECKS OF THE PRESSURIZATION SYS CARRIED OUT AND FOUND SATISFACTORY AT THIS TIME.