As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INPUT, IT WAS REQUIRED FOR THE FLAPS TO BE DEPLOYED. DURING DEPLOYMENT, A LOUD GRINDING SOUND HEARD FROM THE LT WING INBD FLAP SHROUD. THE DEPLOYMENT WAS STOPPED. ON INSPECTION, FOUND THAT THE FLAP DRIVE INTERMEDIATE GEARBOX L79CF HAD SHEARED FROM ITS ATTACHMENT BRACKET.