As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IT WAS REPORTED TO MAINTENANCE THAT THE FLAPS HAD STUCK IN THE UP POSITION. MAINTENANCE FOUND THE PRELOAD SHIM MISSING FROM THE RT FLAP. THERE WAS ENOUGH GLUE ON THE FLAP AREA TO PARTIALLY ADHERE IT TO THE WING FAIRING. THIS CAUSED THE FLAP TO STICK WHEN SELECTED DOWN. THE SHIM WAS REPLACED AND ACFT RETURNED TO SERVICE.