As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE RAMP WITH APU ON, WHITE SMOKE FILLED COCKPIT. APPEARED TO COME FROM COCKPIT PAC. NO SMOKE IN CABIN. ODOR WAS DETECTED FROM COCKPIT PAC IN FLIGHT WITH APU OFF. REMOVED AND REPLACED AFT (COCKPIT) ACM. LEAK AND OPS CHECKED GOOD IAW MM 21-51-00. CLEANED COCKPIT WATER SEPARATOR SOCK.