As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MKE - CREW REPORTS, AFTER LANDING THE LT LAV SMOKE DETECTOR SOUNDED. FLIGHT ATTENDANTS REPORT SMELLING FUEL FUMES AND THE CABIN SLIGHTLY CLOUDED. RAN BOTH PACKS ON GROUND AND COULD NOT DUPLICATE SMOKE OR FUMES IN CABIN. SMOKE DETECTOR OPS CHECK GOOD. SUBMITTER SUSPECTS SPRAY FROM TAXI INJESTED IN APU. RETURNED A/C TO SERVICE.