Giving the old girl a well earned end-of-season service. To change the transmission oil the handbook shows two drain plugs either side of the transmission housing, one of which holds the suction pipe in, and the strainer. Found these OK. However there's another drain plug (I assume that's what it is) further forward on the clutch housing, about eight inches backward of the engine sump plug. As the gearbox and transmission are supposed to be linked oil-wise, do I need to drain out of this plug as well? (I don't think I've drained the stated capacity of oil yet)