As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE WAITING FOR PAX, LINEMAN NOTICED SMOKE COMING FROM ACFT. UPON INSP, SMOKE POURING OUT OF ACFT EXHAUST. IN AFT EQUIPMENT BAY COMPRESSOR WAS SMOKING. DISCONNECTED GPU AND BATT. REPLACED AIR CONDITIONER MOTOR ASSY WITH AN OVERHAULED UNIT IAW MM SECTION 8.8. LEAK AND OPS CHECK GOOD.