As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ILLUMINATES ON MASTER CAUTION RECALL, EXTINGUISHES DURING RESET. GROUNDED-YES. REMOVED AND REPLACED RIGHT PACK TEMPERATURE CONTROL VALVE, PER B737-800 AMM 21-51-10. OPERATIONAL CHECKED GOOD AT THIS TIME, NO FAULTS FOUND.