I have a old 843 I use around my paddock and the 4in1 has stopped working I pulled the valve bank out and put new seals in that bank but did not fix the problem I cracked open the nut on the tilt and also the 4in1 there was oil flowing through the tlit side but not the 4in1 I notice next to the 4in1 bank there is a bank not being used that did have 2 wires running to it that have been disconected any suggestions cheers