What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) N933JN, an Emb-145-LR, being operated as American eagle flight 4409, departed des moines, IA, enroute to chicago, IL. The pilot declared an emergency and diverted to Omaha, NE. The crew reported to company personnel that they received a lav smoke warning indication in the cockpit, and the flight attendant reported smoke and saw a blue haze after lift off. The aircraft landed safely in Omaha, NE. Contract maint inspected the aircraft and performed an engine run up to full power. They were unable to duplicate the problem. Company mechanics reported that they also could not duplicate the problem. The aircraft was returned to service.
As the FAA filed it
(-23) N933JN, AN EMB-145-LR, BEING OPERATED AS AMERICAN EAGLE FLIGHT 4409, DEPARTED DES MOINES, IA, ENROUTE TO CHICAGO, IL. THE PILOT DECLARED AN EMERGENCY AND DIVERTED TO OMAHA, NE. THE CREW REPORTED TO COMPANY PERSONNEL THAT THEY RECEIVED A LAV SMOKE WARNING INDICATION IN THE COCKPIT, AND THE FLIGHT ATTENDANT REPORTED SMOKE AND SAW A BLUE HAZE AFTER LIFT OFF. THE AIRCRAFT LANDED SAFELY IN OMAHA, NE. CONTRACT MAINT INSPECTED THE AIRCRAFT AND PERFORMED AN ENGINE RUN UP TO FULL POWER. THEY WERE UNABLE TO DUPLICATE THE PROBLEM. COMPANY MECHANICS REPORTED THAT THEY ALSO COULD NOT DUPLICATE THE PROBLEM. THE AIRCRAFT WAS RETURNED TO SERVICE.