As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN REMOVING ENGINE COWLING FOR SCHEDULED MAINTENANCE, THE AIR INTAKE HOSE CONTAINED APPROXIMATELY 24 OUNCES OF WATER. IT HAD ACCUMULATED BETWEEN THE COWLING INTAKE AND AIR FILTER AFTER THE AIRCRAFT HAD BEEN WASHED. THIS HAS OCCURRED ON THREE OTHER AIRCRAFT IN FLEET OF SAME MODEL.