The first thing to do is to locate where exactly the leak is coming from.

Move the shower away from the wall/corner and look both behind back and also under the tub.

Check the grey water hoses where they connect to the back of the shower and also connect to the different outlets (monsoon, hand shower, foot massager etc). The hoses connect to the central back of the shower into the divertor assembly. The hoses are connected using jubilee clips. Check these have been tightened.

Check also at the joins between the panels. If you have sealed the shower, ensure the water run in niches have not been sealed over, preventing water from returning to the tray.

Check under the tray. Check the connections to and from the waste assembly. Check the fittings are tight/secure and dry.

Also check the connections to that are made to the Steam Generator.