Go to youtube, type in; removing BMW door panel replacing window regulator. Have your husband watch the one that is 24 minutes long. It shows how to replace the window regulator but when he takes off the panel, he should check the plastic clips that hold the window to the regulator. They will break causing some of the symptoms you have and the clip is only a couple of dollars. I have had to replace 1 regulator but 4 of those clips. Think the dealer wanted bout $326 to fix. Piece of cake. Think the problem with the wiper is the only issue i have not had. Hope it helps.