As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED ON THE GROUND AND WOULD NOT RESET. ACFT GROUNDED. TESTED LT PACK SYSTEM IAW FIM 21-31, TASK 801. NO FAULTS INDICATED AND COULD NOT DUPLICATE DEFECT. THERE IS NO MAINTENANCE HISTORY FOUND WITHIN THE PAST 30 DAYS.