As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 18000' GOT MASTER CAUTION AND THE RIGHT PACK LIGHT. RAN THE CHECKLIST AND RIGHT PACK LIGHT WOULD NOT EXTINGUISH, CONTINUED FLIGHT WITH THE LEFT PACK. GROUNDED-YES. LONG HISTORY. ACCOMPLISHED LT AND RT PZTC BITE-NO FAULTS LOGGED, REF B737-900 FIM 21-62 TASK 801. RT PACK OPERATIONS IN HOT AND COLD, NO RT PACK OVERHEAT. REMOVED AND REPLACED RT PACK RAM AIR INLET ACTUATOR AS PRECAUTIONARY DUE TO HISTORY, REF AMM 21-51-21. BITE AND OPERATIONS CHECK GOOD.