I just steamed up my Accucraft/Aster BR Standard 5 for the first time since this winter. I've noticed my safety valve starts to weep once I get 1 bar of pressure and I can't keep boiler pressure up without the draft fan in place. All the steam seems to be going out the safety valve and none is reaching the cylinders when I open the throttle. Does anybody what is causing this and what I can do fix it? Any help would be appreciated.