Active job

Roof Leak - Possible Flashing Issue

I have leakage coming in, I think, from deteriorated flashing on my tile roof. I need an assessment of the job and if the job DOES mean that the flashing needs replacing on my tile roof, presumably this would require some cladding removal/replacement as well? The photo included shows the area currently leaking however any replacement would be for the entire area where the top storey meets the bottom storey. At this point I need advice/quotes/timeline of availability, etc.