I remember a flight back in 2012 where because the plane had flown 3 times with the orange light not working for the lavatory the plane could not depart. I remember asking why they did not just move the part from one of the working lights. We were waiting for the part for over two hours and they ultimately moved one of the orange lights from one of the back toilets.

I certainly understand the orange light is to help a passanger thar needs assistance in the lavatory and why it is okay to fly with the light bot working for 3 flights but not 4 was beyond confusing to me. To be clear the lavatory worked - it was the call button that had malfunctioned. We were at ORD and I was surprised that they were needing to fly the part in from somewhere else