On our shakedown cruise to Alaska, was so exhausted that I made a rookie mistake not once, but TWICE!! Flushed the black tank with the dump valve closed. Talk about a $hity experience! Managed to clean it all up but decided to just throw the towels away the second time. Turned out I had congestive heart failure and it was effecting my thinking process. Biggest problem was the door not functioning correctly, replacing the electric tongue jack, repairing the crooked seal on the toilet and a couple of minor things.