What was found
(CAN) AFTER DEPARTURE WHEN GEAR SELECTED UP, NOSE GEAR IND SHOWED DOWN AND LOCKED. AIRCRAFT RETURNED TO YHM. MAINT REPLACED NLG POSITION AND LOCK SWITCHES (NOSE). AIRCRAFT DEPARTED AND RETURNED AGAIN. CREW REPORTED GEAR REMAINED EXTENDED. MAINT FOUND NLG LOCK ACTUATOR BUNGEE FROZEN, REPLACED AND A/C RETURNED TO SERVICE.