As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PARKING AT THE GATE, THE CABIN & COCKPIT FILLED WITH SMOKE & AN ODOR. APU WAS RUNNING & PACKS WERE ON. NOTICED ON WALK AROUND AFT BELLY OF ACFT HAD DRIPPING OIL. PERFORMED MX IAW TC 21-059-008 & TC FO592102. PLACED APU ON MEL 49-01 SIT 1 CAT C DMI 15254. M PROCEDURES COMPLIED WITH. PLACARD INSTALLED.