well from that I can say your electrician has not got the right experience. the switches on the front are a remote control for the board. your problem will be in the board most likely
what I don’t know now is what sort of lights are in use. they can be 240v or 12v fed through a transformer
if they are 240 then if a lamp pops and the wrong fuse is fitted (should be 3A) then it blows the board instead of the fuse
if they are 12v it may be a transformer fault
what I am saying is you need to be sure of the problem before you change an expensive component
Dave