As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE ADJUSTED TEMP TO WARM UP COCKPIT GET A STRONG SMELL OF FUMES, EXHAUST AND OIL. DONNED O2 MASKS AND RAN SMOKE REMOVAL CHECKLIST. SMELL LINGERED ACCOMPLISHED AMM 05-51-56/301. FIM 21-00-01/301 USED TO IDENTIFY APU AS SOURCE OF OIL CONTAMINATION IN AIR CONDITIONING SYSTEM. DEFERRED APU ON BARCODE T3F18E003V7AC. CLEARED FUME SMELL USING AMM 21-00-01/201. AIRCRAFT OK FOR SERVICE.