Espresso machine problems

I have a Faema, two group head machine, I believe its a E87. Hard to tell, markings are worn. Anyway...I had trouble with the auto fill water valve. It was opening, however no water was passing trough. So, I took apart and cleaned the valve. It did have a lot of calcium build up that was clogging the ports. Great, found the problem, however now I have another. I put it back together and now water trickles by (uncertain, which port) eventually filling up the boiler causing it to overfill the boiler. So consiquently water leaks out of the pressure relief valve on top of the boiler. The valve has three seats with springs, so is it possible I crossed any of the parts? Do you have any suggestions? Should I replace all the parts in the valve? And if so, where could I purchase the parts? I would also like to find a manual... This would help out also. Your help is greatly appreciated. Rick