What was found
MCN - FLT 7820 - WAS IN MCN FOR GEAR CHANGE. DURING FUNCTIONAL TEST FLIGHT, AFTER GEAR CHANGE, CREW REPORTED THAT AFTER TAKEOFF THE LANDING GEAR LEVER WOULD NOT MOVE TO UP. MAINTENANCE ADJUSTED THE GROUND SPOILER INTERLOCK VALVE CABLE IAW B737-300 AMM 27-62-51-825-001 AND 27-62-51-725-011. ADJUSTED UP LOCK SENSORS IAW B737-300 AMM 32-61-21-825-001. OPERATIONAL CHECKS AND GEAR SWINGS WERE GOOD IAW BOEING 737-300 AMM 32-32-00-715-001.