I have an integrated washer/dryer with an internal blockage. I've tried clearing the filter and it makes no difference, the drum still won't drain after a wash. It doesn't quite come all the way out from the kitchen unit because it's actually wired straight into the wall. Considering it's an integrated machine and wired direct to the wall, few tradesmen are willing to go near it. I don't even really know what sort of tradesman I need. Any advice, help or recommendations would be appreciated.