I think your thread is there for life, but good since it helps others. I spent time on my switches too, until I found with a multimeter that the source power was dropping when I tried to actuate. The problem was simply corrosion on the tips of the fuses. The give-away is that diagonal windows both stop working - FL & RR or FR & RL, since one fuse powers 2 diagonal windows. Same deal with my sun-roof. The copper (gold-plated?) fuses are supposed to be better than tin.