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Howard
@Pantsmaster
Damp is a bugger to investigate the root cause of. Could just be internal condensation, although it’s a weird place for it if that’s the only spot. Do you have a humidity sensor?
What’s the outside of the wall look like?
If it’s only around the sockets - wonder if the wire chases were filled with bonding first. I’m not sure how true it is really but I remember reading that it shouldn’t be used on external walls because it can attract/concentrate damp.