Removing Fuel pump / from Komatsu PC45 – help please

HI guys I have to remove the fuel injector pump from the diesel motor on my Pc45-1 as the welsh plugs ( or known as ice plugs in the states i think ) have sprung a leak - so need to get behind it to put new ones in ( will replace all in one go ) any real trick to getting this injector pump off ? looking for replies from people that have done it before thanks