As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(APU) EN ROUTE, AFTER TAKE OFF CABIN FILLED WITH A HAZE. FLIGHT ATTENDANT IN REAR REPORTED IT WAS DIFFICULT TO SEE FROM REAR TO FRONT OF CABIN. LANDED WITHOUT INCIDENT. REPLACED APU ASSEMBLY DUE TO LEAKING AT INTAKE. ACCOMPLISHED PACK BURN. SYSTEM GROUND CHECKED NORMAL OPERATION.