As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT EXTEND WITH NORMAL SYSTEM. EMERGENCY EXTENSION SYSTEM WAS USED TO EXTEND GEAR. NOSE LANDING DOWNLOCK INDICATOR SWITCH / NOT LOCK SWITCH FAILED IN NOT LOCK POSITION WHICH PREVENTED SIGNAL FOR GEAR DOWN OPERATION. SWITCH FAILED CONTINUITY TEST. NEW SWITCH WAS INSTALLED, GEAR OPERATED CORRECTLY.