What was found
FLT 4022 - AFTER TAKEOFF, RIGHT MAIN LANDING GEAR WOULD NOT RETRACT. CREW CYCLED GEAR SEVERAL TIMES WITH NO SUCCESS. AIRCRAFT RETURNED TO FIELD, LANDED WITHOUT INCIDENT. PIT MAINTENANCE INSPECTED LANDING GEAR SYSTEM, FOUND RT MAIN GEAR UPLOCK ROLLER IN NEED OF LUBRICATION. LUBRICATED RT AND LT MAIN GEAR UPLOCK ROLLERS IAW MM 32-10-00 AND STANDARD MAINTENANCE PRACTICES. FUNCTION CHECK FLIGHT (FCF) CHECKED GOOD, AIRCRAFT RETURNED TO SERVICE.