As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER PILOT SELECTED GEAR DOWN, THERE WAS NO INDICATION THE NOSE GEAR WAS DOWN AND LOCKED, ACFT DIVERTED BACK TO MX BASE. ON ROUTE NOSE GEAR INDICATION CAME ON. ACFT LANDED WITHOUT INCIDENT. MX REPLACED NOSE GEAR DOWN LOCK INDICATOR SWITCH AND RETURNED TO SERVICE.