Triton bewitch electric shower?

I had a new bathroom and shower fitted c. 5 years ago with the above shower and it seems to have packed up on me! You can hear the water pump but no water comes out of the shower. I called an Electrician out to look at it and he seems to think it needs replacing. Due to all the bathroom works and tiling I've had done, I need this to be installed with minimum damage i.e. non-removal of tiles etc. I would ideally want a replacement unit of the exact same shower which I believe also needs to have the cold water pipe and cable on the right hand entry of the unit for it not to affect the installation (like for like). Alternatively I do not know if this can be repaired - can you please advise ?