As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL230, TURNED TEMP UP ON LT PACK AND GOT A STRONG BURNED OIL ODOR IN COCKPIT DESCENDED AND TURNED LT PACK OFF, ODOR WENT AWAY. INSP ACM, OK COLOR NORMAL. OPERATED SYS AND OIL ODOR COMES BACK SOON AS LT PACK IS TURNED ON. REMOVED AND REPLACED LT PACK COALESCER IAW AMM 21-51-13. OPS CHECK GOOD, REMOVED. (K)