As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, ENGINE IDLE, SMELLED A STRONG ODOR IN THE COCKPIT. HAPPENED AGAIN IN IDLE ON RAMP. SMELLED LIKE ENGINE EXHAUST. MAINTENANCE PERFORMED JOB CARD 26L00021001 CABIN AIR QUALITY AND 26L00021002 APU ODOR IN CABIN. REPLACED COOLING FAN IAW AMM 49-52-51. PERFORMED APU INLET CLEANING IAW JOB CARD 26T31049004 AND DECONTAMINATION IAW JOB CARD 26L00021004.