As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE RUNNING APU, NOTICED ODOR LIKE DIRTY SOCK. AFTER TAKEOFF, NOTICED ODOR LIKE BURNING OIL. NO SMOKE SEEN. REMOVED AND CLEANED OZONE CONVERTERS REMOVED AND CLEANED HEAT EXCHANGER. RE-INSTALLED HEAT EXCHANGER, PER NETJETS REPLACED R/H OZONE CONVERTER. CLEANED DUCTING GOING TO THE COALESCER. RE-ASSEMBLED RAN ENG'S APU, NO SMELL NOTED. ALL LEAK CHECKS GOOD. DONE IAW CE680 MM CHP 21-21-03.