Just do the solder points that look bad (cracked in a circular manner around the solder point). I think the bad ones look a little like a volcano at the top and the good ones just look like a smooth peak at the top. Bruno's site, http://www.bmwe34.net/e34main/mainte...trical/LKM.htm has a pretty good write-up on this repair. I think there is another good write-up on-line somewhere else, just can't remember where. Anyone else have it?