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Combination tank on a raised shelf in a 2 door cupboard. Top cupboard door is jammed shut as it has 'swelled up'. Some evidence of 'wetness' but hard to say where it is coming from but...the ceiling above the cupboard, outside of the cupboard, is showing wet patches. Is there a plumbing equivalent of fluorescent dye used in automotive?
I think it could be
I think it could be
- leak from roof into cupboard (obviously nothing to do with plumbing
- condensation from header tank
- header tank overflow pipe/joint leaking
- header tank ball and/or valve worn
- something I have no idea about