As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, THE RIGHT PACK WAS UNABLE TO PRESSURIZE A/C. THE LT PACK WAS ON MCO. CHECKED NR 1 AND NR 2 CABIN PRESSURE CONTROLLER BOTH CK GOOD. CHECKED ALL DOOR SEALS AND OUTFLOW VALVE. AFTER LT ACM CHANGE PRESSURIZED A/C TO 5 PSID WITH APU NO LEAKS NOTED.