As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IT IS POSSIBLE THAT DUE TO NORMAL WEAR OF THE ENGINE COWL CAUSED CONTACT WITH THE NLG DOOR EDGE PREVENTING THE NLG FROM FULLY EXTENDING. IN ADDITION IT IS POSSIBLE THAT DUE TO THE INCORPORATION OF STC SA 5934SW, REMOVING HYDRAULIC POWER FROM THE NLG, ACTUATION PREVENTED FORCING THE DOOR ALL THE WAY OPEN WHICH WOULD ALLOW THE GEAR TO FULLY EXTEND.