As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R-PACK LIGHT DURING MASTER CAUTION RESET LIGHT GOES OUT. GROUNDED - YES. R-PACK PRIMARY TEMP CONTROL INOP. PERFORMED BITE, CONFIRMED R-PACK TEMP CONTROL VALVE FAILED. REMOVED AND REPLACED R PACK TEMP CONTROL VALVE REF B737-800 AMM 21-51-10. TEMP CONTROL VALVE OP AND LEAK CHECK GOOD.