As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GROUND CREW REPORTED SMOKE FROM APU EXHAUST AREA. FIRE DEPARTMENT RESPONDED. OPENED APU COMPARTMENT. NO OIL ON THE EXTERIOR. APU EXHAUST IS OK. PER FIRE DEPARTMENT NO FIRE AGENT REQUIRED, SMOKE ONLY. CLOSED APU COMPARTMENT. NO OIL IN SITE GLASS. REPLACED APU AS PRECAUTIONARY.