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  • This sounds like a great reason to get a multi tool tbh.
    I’m going to go through the various test stages to narrow the location down but tbh I suspect the shelf bit on the left side. No idea what construction is going on underneath though.

  • That is very likely one area, maybe not the only one but you'll have more of an idea when you cut the sealant out. If it has discoloured or moulded on the hidden bits then it's leaking.

    Fein are the original multitool manufacturer and you'll not regret buying one in the long run. They do a set which comes with grout and cutting blades but not the sealant cutting blade. I use a spray called multi solve to get rid of any remaining sealant.

    It's a horrible job but the multi tool makes it bearable, try doing it with a Stanley blade first if you need convincing. The chemical sealant softeners are not to bad I just prefer to avoid using that type of chemical if possible.

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