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Water ingress issue

I am a Property Manager looking for someone to quote or an estimate on a water ingress issue for my rental property. There seems to be a slow water leak behind the wall between the hwc and the bathroom. There are a couple of issues with solving where the leak is actually coming from so the wall will need to be opened up to investigate. It could be a leaking pipe or it could have be a leak from the roof (roof has now been repaired). The other issue is that the cupboard space is tight around the hwc. The bottom of the cupboard door has swollen so will need to be replaced as well. I have attached photos of the water leaking down to the bathroom door, inside the hot water cupboard and the wall where we investigated. The hole is from just pushing on it.