As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCHARGE AIR FROM CABIN PAC EMITTING A OILY FOUL ODOR. REPEAT WRITE UP ISOLATED CABIN PAC IN FLIGHT. THE SMELL SEEMS TO BE COMING FROM THE CABIN PAC. TROUBLESHOT TO LEAKING ACM. REMOVED & REPLACED ACM ASSEMBLY WITH REPAIRED UNIT, IAW THE CE750 M/M CHAPTER 25-51-00. OPERATIONAL & LEAK CHECKS NORMAL. CLEANED COALESCER SOCKS IAW THE CE750 M/M CHAPTER 21-51-00. LEAK & OPERATIONAL CHECKS NORMAL.