As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PACK PRODUCES A SMOKE ODOR. AT FL410 FOR 3 HRS, CABIN PAC WAS IN AUTO ON FULL COLD FOR 1 HR + (~50*). CHECKLIST ISOLATED ODOR TO THE CABIN PAC. PRE FLIGHT SHOWED OIL FULL. REMOVED AIR CYCLE MACHINE PN 738384-33 S/N 9901083 AND INSTALLED REPAIRED PN 738384-33 SN 207010237A. INSTALLED NEW COALAZER PN 21BC-115 IN BOTH ACM SYS. RUN UP AND OPS CHECK SATISFACTORY. ALL WORK DONE IAW MM 21-51-00.