As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TROUBLESHOOTING OF A L/E FLAP/SLAT DEFECT, UPON CYCLING FLAPS UP & DOWN HYD SYSTEM "A" MODULE CHECK VALVE FAILED, THREADED CHECK VALVE DEPARTED THE HOUSING BODY, THREADS PULLED FROM HOUSING BODY. SYSTEM A MODULE REPLACED, ALL SYSTEMS CHECKED NORMAL.