As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE LANDING GEAR FAILED TO EXTEND NORMALLY AND A MANUAL LANDING GEAR EXTENSION WAS PERFORMED. THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT AND MAINTENANCE DETERMINED THAT THE CAUSE OF FAILURE WAS CORROSION AT PCB A123. THE CORRODED SOCKETS WERE REPLACED, LANDING GEAR EXTENSION AND RETRACTION CHECKS WERE SUCCESSFUL, AND THE AIRCRAFT WAS RETURNED TO SERVICE.