Hi, before I start dismantling everything, I just wondered if there was anything simple to check? My early, 1959, b275 has just started pouring hydraulic oil out somewhere below the selector valve block or perhaps from the front of the base of the top casing over the axle. They are so close, I cannot see from which! The trouble with taking the selector valve block off is that I won't be able to start the engine to check the latter. Any ideas?