Bad ground is probably the issue. I you put the unit on a jack stand or have it connected to your TV. You can remove at least one mounting bolt. sand the corrosion away. Then before reinstalling the bolt, by a star washer, to put between the nut and the frame. This type of washer will bit into both pieces of metal and give you a much better ground.
As for the couch, are you talking about the arm on the J-sofa? If so, I have not personally looked, but when mine was in for some warranty work the first year I had it. On the list things they did they noted they found one of the arms rests loose and they tightened it. I would probe around looking for a few screws. The cup holder pops right out, and if you lift the sofa to make the bed, you may also find a few hidden screws. That is where I would start.
As for the low point drain, they are cheap cheap plastic that degrades. Personally, I would take it off, measure the hose size and go to your favorite hardware store and buy a valve that fits the hose size, you may need a couple fittings to make the transition. This would allow you to drain your tank much faster.
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