As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED, WHEN MASTER CAUTION WAS RESET, THE LIGHT EXTINGUISHED. ACFT GROUNDED. REMOVED & REPLACED THE TCV V139 IAW AMM 21-51-10-000/400-801. PERFORMED AN OPS TEST IAW AMM 21-51-00-710-801. CHECKED GOOD. NO FAULTS SHOWED. OPS NORMAL.