As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE LANDING GEAR WOULD NOT EXTEND WITH THE LANDING GEAR HANDLE PLACED IN THE DOWN POSITION. TROUBLESHOT LANDING GEAR AND FOUND THE NOSE GEAR DOOR CONTROL VALVE INOPERATIVE NOT ALLOWING THE GEAR DOOR TO OPEN. NOSE GEAR DOORS WOULD OPEN WHEN GROUND HANDLE WAS OPERATED TO OPEN DOORS. (ON JACKS) THE NOSE GEAR WOULD EXTEND. THE DETERMINED CAUSE OF FAILURE OF THE NOSE DOOR CONTROL VALVE IS UNDETERMINED, HOWEVER THE VALVE WILL BE SHIPPED TO MFG AS A CORE FOR POSSIBLE OVERHAUL.