Alpha Boiler CB24X Possible PCB Fault, Amber light on but very dim.?

Hi, Need help to verify the fault with my boiler. I have got a alpha CB24X boiler. A few weeks back. The red and amber light flashing alternatively, so I guess its time to top up, after top up the two light still flashing. So I have check the installation guide and found that maybe the pressure switch is faulty. As I try to pull one of the connector's out, the red light is gone and the amber light flash every few seconds. So happy day, that movement was enough to put right. And today the same thing happened. And however I tickle that pressure switch, nothing will happen. So I get a cable across the two pin and hoping to get through the night before I get another Primary pressure Switch. It works at the first go, but later when I go back to secure the cable connection a little bit more, the amber light off. Well, it's in-fact on, but dim down so much I can barely see it. The light is no longer flashing but steady. If I turn power off it will turn off. Turn power back on it will come up the same. Now I guess I have blown some chip or fuses. As I intend to give a go to repair the PCB myself. Wonder if any wizard out there can let me know which possible chip/capacitor I have blown. Where can I get a graph to diagnoses this PCB. Many many thanks!