As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START + MC RECALL, R PACK LIGHT WOULD NOT EXTINGUISH. RIGHT PACK ILLUMINATED ON RECALL AT TOP OF DESCENT, LIGHT EXTINGUISHED WITH MASTER CAUTION RESET. REF ASA L/P 60493842. GROUNDED - YES. REMOVED AND REPLACED TEMP CONTROL VALVE REF. B737-900 AMM 21-51-10.