Take the plasterboard off complete with tiles attached and reboard. even if you don't wreck the surface getting the tiles off all the fixings will be loose, its quicker to take it all off and start again.
if they are old tiles or were fitted in a new build there a small chance they may come off very easily. a lot of new builds dont prime and tile too early as they are in a rush so tiles come off dead easy.
Chances are though that the previous poster is right
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