Working on the BMW E61 525D 2005.
I did some work on this one. It had some water leaks in the winter, so I cleaned the sun roof drains, but I think the problem s the rear passenger side door, the foam came of and probably let some water in, I glued it back on, but I think in the future, I will have to replace that door, because it's kind of rusty. Also I cleaned the underside and undercoated it.