As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT INSPECTION OF FLT NR 7394, THE CREW NOTED A SMOKE SMELL IN THE CABIN. CREW NOTIFIED MX CONTROL OF PROBLEM AND MAINTENANCE WAS DISPATCHED PROBLEM WAS FOUND TO BE APU OIL ENTERING THE AIR INTAKE AND CAUSING SMOKE IN THE PACS. THE APU IS CURRENTLY DEFERRED. AIRCRAFT WAS RELEASED FOR CONTINUED SERVICE WITH THE APU DIFFERED.