You should visual check inside the drawer compartment. There might have some coffee dregs that fall behind the drawer and this is what blocking it to go all the way in. There is a limit switch that is closed only if the drawer is in its place and when this switch is open the machine give the massage "missing drawer" light on.
So you use a brush and a vacuum cleaner to clean the drawer depart very good from any coffee remains in order the drawer to sit very good in its place so the limit switch will switch off.
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