As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GROUND WITH GPU, AVOINICS AND AIR CONDITIONING ON, CABIN BEGAN TO FILL WITH AN ACIDIC WHITE SMOKE. AIR CON COMPRESSOR LIGHT WAS STILL ON. SHUT OFF ENTIRE ELECTRICAL SYS. AFT EGUIPMENT BAY ALSO FILLED WITH THE SAME SMOKE. REMOVED AND REPLACED AIR CON COMPRESSOR CONDENSER MODULE ASSY IAW MM 21-52-00. OPS AND LEAK CHECKED NORMAL.