What was found
CLIMBING THROUGH FL360 THE NLG ATTEMPTED TO EXTEND & RETRACT ITSELF REPEATEDLY. GEAR UNSAFE RED LIGHT CAME ON & OFF EACH TIME, BLEW GEAR DOWN PNEUMATICALLY ON APPROACH. PERFORMED VISUAL INSPECTION TO EMERGENCY GEAR EXTENSION SYSTEM IAW CE 750 MM FOR A ONE TIME FERRY FLIGHT TO ICT FOR INVESTIGATION, AIRCRAFT HAS NUMEROUS WRITE UPS ON THIS DISCREPANCY. TROUBLE SHOT UN-COMMANDED NOSE GEAR EXTENSION & FOUND UP-LOCK HOOD BOLT CORRODED, BEARINGS WORN & SPRING WEAK, THIS COMBINATION WAS NOT ALLOWING THE UP-LOCK ACTUATOR TO BE FULLY EXTENDED. INSTALLED NEW BOLT P/N NAS464P5-37, INSTALLED 2 NEW BEARINGS P/N M81934/2-05C008, INSTALLED NEW SPRING P/N 5527401-3 IAW CESSNA 750 MM CHAPTER 32-30-05. ADJUSTED NOSE GEAR UP-LO