As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED DURING MASTER CAUTION RECALL. EXTINGUISHES WHEN CLEARED. GROUNDED - YES. ACCOMPLISHED LEFT PACK BITE I/A/W B737-800 FIM 21-62 TASK 801. FOUND TCV FAULT. WAS ABLE TO RESET TCV. LEFT PACK OPS CHECK GOOD IAW FIM 21-62 TASK 830.