As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C W/N PRESSURIZE, APPEARED LEFT PACK NOT SUPPLYING AIR TO A/C. RAN ENGS, PERFORMED AIR COND AND PRESSURIZATION OPS TEST PER JET RUN HDBK CHAPTER 7 & 5A. PRESSURIZED IN AUTO AND MANUAL MODE. BOTH TEST CHECK NORM BOTH PACKS MAINTAIN AIR.