As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, DURING INITIAL DESCENT AFTER PULLING POWER BACK, THE CREW NOTED A LT PACK FAIL/CABIN HIGH CASS MESSAGES AT FL280. THE CREW DEPLOYED THE O2 MASKS AND REQUESTED FL100. THE CREW MADE AN UNEVENTFUL LANDING. MX INSPECTED THE AC AT MULTIPLE POWER AND BLEED CONFIGURATIONS BUT WERE UNABLE TO DUPLICATE PROBLEM. WITH NO FURTHER DISCREPANCIES RETURNED THE AC TO SERVICE. PROBLEM HAS NOT RETURNED. (K)