What was found
AFTER DEPARTURE & THE GEAR WAS RETRACTED THE RED GEAR UNSAFE LIGHT REMAINED ILLUMINATED, INDICATING THAT ONE OR MORE OF THE LG WERE NOT IN THE UP POSITION. THE LG WAS CYCLED SEVERAL TIMES & EACH TIME FAILED TO RETRACT PROPERLY. THE GEAR WAS EXTENDED & SINCE THE ACFT WAS ABOVE THE MAX LANDING WEIGHT THEY WERE REQUIRED TO BURN OFF FUEL BEFORE LANDING. EXTENSIVE TROUBLESHOOTING WAS UNABLE TO DETERMINE THE CAUSE OF THE LG FAULT. FUNCTIONAL CHECKS ON JACKS COULD NOT DUPLICATE THE DISCREPANCY. A CHECK FLIGHT WAS REQUESTED & THE SAME FAULT WAS REPORTED AFTER THE FLIGHT. FURTHER TROUBLESHOOTING ONLY FOUND THE LT MLG UNLOCK STIFF. ALL THE GEAR UP LOCKS WERE CLEANED & LUBRICATED. THE SECOND CHECK FLIGHT WAS SATISFACTORY.