ive tried to fix my drivers side elec window cos it packed in the other month, ive done searches on this site and got various info ranging from replacing the motor to giving it a good wack and some wd40? so i tried the latter, with my finger pressing the switch i sprayed the unit with wd40 and tapped it a few times, the thing is when i press the button you can hear it slowly trying but not accutally moving it? and after all the slow pushing sounds it will actually move the window a millimeter up, the motor was getting quite warm also when i kept my finger pressed and it wasnt moving it, do i need to replace the whole unit or.....?