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Hi, I've got a VERY slow draining kitchen sink !!! To set the scene, the sink has a standard U-bend trap which then runs horizontally to a vertical down pipe. Approx. 18 inches below this another U-bend trap directly under the sink - the washing machine and dishwasher both empty into this...

I have a 1 gang 2 way switch at top and bottom of stairs. Recently, the top switch seems to have gone to 1 way action only. i.e. the stair lights will only turn on with the top switch is in the up position and the bottom switch turns the lights on and off. With the top switch in the down...