As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED W/ MASTER CAUTION RECALL. GROUNDED - YES. CONFIRMED FAULT. COMPLETED B737-900 FIM 21-62 TASK 801. NO FAULTS NOTED. RAN APU & PACK SYSTEM W/ NO LIGHT ILLUMINATION. OPS CHECK WAS SATISFACTORY. NO FURTHER ILLUMINATION W/ MASTER RECALL.