sabere 25he died pcb change which one ?

Hi my boiler fitted last november so not even 1 year old . tried fault diagnosis fan runs pump runs no hot water or heat pilot no spark tested power all points to pcb fault . my problem which one there are two parts main board part 10025340 and side one that fits on part 10022174 a guy on e bay is selling main part for £126 plus £7 delivery but unsure if this is what i need any ideas bob ps anyone got a cheaper spare !!