What was found
LAX FLIGHT NR 2444: WHILE PUSHING BACK FOR DEPARTURE, THE TUG DRIVER NOTICED THAT THE NOSEWHEEL HAD FLUID DRIPPING. PULLED BACK INTO THE GATE AND SHUT DOWN. A LARGE PUDDLE UNDER THE NOSEWHEEL FORMED PRIOR TO SHUTDOWN. MAINTENANCE REMOVED AND REPLACED STEERING MANIFOLD SWIVEL JOINT IAW Q400 AMM 32-51-16-000-803 AND 32-51-16-400-803. BLED NR 2 SYSTEM AT THE SWIVEL JOINT (STEERING MANIFOLD). CLEANED AREA AND C/W OPS TEST OF NWS SYSTEM TASK 32-51-00-710-801. OPS TEST GOOD. NO LEAKS NOTED. AIRCRAFT RETURNED TO SERVICE.