As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4285, RIGHT PACK DROPPED OFF LINE ON CLIMB THRU 15000. RESET PACK, PACK CLOSED WITH TEMP THRU 20000. RESET PACK, PACK CLOSED HIGH TEMP CAUTION SECOND TIME WITHIN 90 SECONDS OF PREVIOUS RESET AT 23000. EXECUTED EMERGENCY DESCENT TO 10000. FLIGHT COMPLETED UNPRESSUREIZED. PERFORMED AIR RETURN. REMOVED AND REPLACED RIGHT PRESSURE REGULATING SHUTOFF VALVE PER AMM 21-51-43. OPS CHECKED GOOD. PERFORMED HIGH POWER ENGINE RUNS PER 71-00-00. OPS CHECKED GOOD.