As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A VERY BAD ODOR OF EXHAUST IN FLIGHT DECK WHEN TEMP IS TURN UP. REMOVED AND INSPECTED WATER SEPERATOR FOR SIGNS OF OIL IAW AMM 21-51-13. NO SIGNS OF OIL OR ANY FLUID. PERFORMED INSPECTION OF ACM IAW AMM 21-51-13. LEFT ACM OIL WAS A FEW SHADES DARKER THAN THE RIGHT ACM. SYSTEM OPERATES AS DESIGNED