What was found
LANDING GEAR RETRACTED NORMALLY THEN DURING CLIMB NOSE GEAR LITE ILLUMINATED. GEAR RECYCLED IAW QRH PROCEDURE. RED LIGHT WENT OUT. NOSE GEAR RED WARNING LIGHT ILLUMINATES OCCASIONALLY IN FLIGHT BELOW 210 KNOTS WHEN GEAR LIGHT DO NOT ILLUMINATE. FOUND LARGE GREASE DEBRIS ON NOSEGEAR UP POSITION SENSOR AND INTERLOCK SWITCH ROLLER. CLEANED DEBRIS AND NO FURTHER DEFECTS NOTED. PERFORMED VISUAL INSPECTION OF NOSE GEAR UP LOCK SENSOR, FOUND OK, PERFORMED OPS CHECK. OPS CHECK OK AND OK FOR CONTINUED SERVICE.