What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORTED A STRONGER THAN NORMAL CLEANING OR CHEMICAL SMELL EMANATING FROM THE MIDDLE SECTION OF THE CABIN DURING TAXI THAT SEEMED TO DISSIPATE BUT AFTER AN HOUR AT CRUISE THE ODOR RETURNED WITH A STRONGER THAN NORMAL ODOR - MAINTENANCE FOUND THE APU OIL WAS OVERSERVICED RESULTING IN THE APU INTAKE PLUNUM TO BECOME VERY SATURATED WITH OIL REQUIRING THE INTAKE PLENUM TO BE REPLACE - MAINTENANCE CORRECTLY SERVICED THE APU OIL TANK ALONG WITH CHECKING AND CLEANING THE APU PER JOB CARD 26L31049011