What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) N606NW, on repositioning flight 868 from sioux city, IA to Kansas city, MO when diverted into Omaha, NE, due to smoke in the cabin. The a/c had been delayed with auxiliary power unit (APU) problems in sioux city, IA and the APU was deferred. The a/c departed and during climb thru 19,000 feet the aft lavatory smoke alarm activated. The crew diverted to Omaha, NE. Company mechanics found smoke from the APU oil in the air conditioning ducts. Company mechanics changed the Garrett GCT85 APU, purged the airconditioning system and changed the coalescers. The a/c was returned to service.
As the FAA filed it
(-23) N606NW, ON REPOSITIONING FLIGHT 868 FROM SIOUX CITY, IA TO KANSAS CITY, MO WHEN DIVERTED INTO OMAHA, NE, DUE TO SMOKE IN THE CABIN. THE A/C HAD BEEN DELAYED WITH AUXILIARY POWER UNIT (APU) PROBLEMS IN SIOUX CITY, IA AND THE APU WAS DEFERRED. THE A/C DEPARTED AND DURING CLIMB THRU 19,000 FEET THE AFT LAVATORY SMOKE ALARM ACTIVATED. THE CREW DIVERTED TO OMAHA, NE. COMPANY MECHANICS FOUND SMOKE FROM THE APU OIL IN THE AIR CONDITIONING DUCTS. COMPANY MECHANICS CHANGED THE GARRETT GCT85 APU, PURGED THE AIRCONDITIONING SYSTEM AND CHANGED THE COALESCERS. THE A/C WAS RETURNED TO SERVICE.