how can i fix my baxi 105e?

i had a leek on the boiler got someone out. said it was a gasget replaced that said it should be fine. 3 dyas later a hed another leak in the top left side of the boiler, same person came out. while he was fixing the leak got water on the circuit board. when he tryed to restart the boiler itwouldn't keep going. changed board still no power.
he tryed the boards on his boiler and they work. he has since tryed changing the wiring harness and others bit and nothing works.
it has took him two days so far and i still don't have any water and heating anyone got any ideas- he hasn't. the fan just won't kick in and keep going the power is there but won't stay there. the boiler is 4years old, the board was only replaced last year.
thanks laura