As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AFTER START CHECKLIST LEFT PACK LIGHT CAME ON. LIGHT WENT OUT WHEN MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED LH PACK TCV AS REQUIRED REF B737-800 AMM 21-51-10-000-801 LEAK CKD GOOD NO LEAKS NOTED. PERFORMED BITE CK NO FAULTS FOUND REF AMM 21-61-00-700-806-002.