If they saying that there is half a ton of condensation in the linings etc then I'd love to know if it features in the aircraft's weight schedule? Dry operating weight (he he) is factory derived and won't account for gash atmospheric weight picked up in service. Half a ton is getting towards significant on a 60t aeroplane.
They'd find it on a re-weigh, but until then are we carrying half a ton of unaccounted for moisture?
Wouldn't it be easier just to carry a member of the management on each flight so all the hot air drives the moisture out?