As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN TEMP CONTROL FAILED TO CONTROL DESIRED TEMP. VERY WEAK AIRFLOW IN AFT CABIN, COULD NOT COOL UNTIL 2 HRS INTO FLT. FOUND RT PACK VALVE INOPERATIVE. REPLACE THE VALVE. FOUND FCV STUCK IN ALMOST FULL CLOSED POSITION. VALVE MR21290, PCN 643-9118, REF AMM 21-51-01-401 FOR R & I.