I read, one of your members discovered black marks on his laundry after it had been washed. well we had the same problem, but only on white towels. we tried everything, from hot water flushing, vinegar,bleach sprays,soda crystals. we even called an engineer and he could not find a problem with the machine, so we gave up and bought a new machine.. to our horror the same thing happened on the very first wash... Could it be a problem with the plumming....HELP!!!!!