|Quoting WF2BNN (Reply 3):|
Why would they divert if only one toilet on a 757 is defect?
You can't tell whether the toilet was just in'op or it was leaking any fluids into the cabin / into the fuselage.
While not prone to it, just imagine what a polar liquid with a fairly good conductivity (as water) can cause if it shortcuts an electrical circuit.
Potential bad smell would be another issue ...
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