Coolant Issues, any ideas Options

[gibsonblues]

hi all,
i recently have had cooolant dripping from beneath my manual transmission , not much but enough to notice.
i have searched the site and found similar problems relating to orings in the water pump that fail and the coolant runs down the valley and hence onwards to the transmission where it drips to the ground.
i have had the cooling system pressure tested at 15 pounds and nothing happened, but after 45 mins or so a small amount of fluid(coolant ) was visible .but the mechanic was unsure of the actual place it was coming from due to the position of the timing guard,but assumes it could be the pump.
as i accept this as the fault i am curious as to whether 93, 3.0 v6 petrol nh glx pajero's have 4 welsh plugs or is there a 5th one at the rear of the motor that is only accessable when gearbox or motor is removed.
i do have a manual but it doesnt state how many there are only images of 2 either side of the power plant .
so does anyone know how many welsh plugs these models have ??

regards gibson