As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4570, CREW REPORTED NR 2 A/C PACK CYCLING FROM FULL HOT TO FULL COLD AND AN OILY ODOR WITH NR 2 PACK ON. REMOVED AND REPLACED THE DUEL TEMPERATURE CONTROL VALVE ON NR 2 PACK IAW AMM 21-60-01. OPS CHECKED GOOD. ACFT RETURNED TO SERVICE.