As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING PRE-FLIGHT INSPECTION, THE ACTUATOR FOR THE ENGINE INTAKE BYPASS DOOR (PARTICLE SEPARATOR) FAILED TO STOP RUNNING WHEN THE DOOR OPENED. MAINTENANCE FOUND THE SCREW SHAFT OF THE ACTUATOR HAD BEEN SCREWED OUT OF THE ACTUATOR HOUSING. MAINTENANCE REPLACED THE ACTUATOR.