roof leak

Hi All, My Grandads house has an veranda out the back that goes under the upstairs bathroom. The waste pipes from the sink and toilet then head down into the roof. This appears to have not been flashed correct. See image below. Could you recommend the best way to fix this? I was going to see if...

A friend has two of these which bring light into her ensuite and hallway to two storey extension. Over the weekend she noticed water dripping and pooling around inner ceiling plate, but doesn't recall this happening before. I took a look yesterday and managed to get the inner diffuser out...