As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TPA/ATL - FLT 12 - ON CLIMB-OUT, NR 2 A/C PACK TRIPPED. RESET, TRIPPED AGAIN. UNABLE TO MAINTAIN PRESSURIZATION ON LEFT A/C PACK. FOLLOWED ABNORMAL PROCEDURES AND RETURNED TO TPA. REMOVED AND REPLACED FAILED AUTO CONTROLLER AND OPS CHECK OK PER MM 21-31-0. (X)