I have a quite old la pavoni p3v2 110v 2000w two

I have a quite old la pavoni p3v2 110v 2000w two group machine that I have just finished a rebuild on. The machine goes to full temp on the boiler, the steam is great, but I can't get more than about 140 deg out of the portafilters. I ran a few shots to make sure I was getting hot fresh water and nothing changed. I also am not getting hardly any water out of the left portafilter. The hot water tap is fully functioning at temp (180 ish). I am assuming this is because it is a heat exchange boiler and the steam and hot water tap come directly out of the boiler while the group head gets its water from the exchange. Any ideas where to start?