There's now water leak in my porch ceiling per pic below. Definitely the water is sipping fro the drainage fro upper roofing per pic. What product and diy method can I water proof it?

The drainage was water proofed few years ago at $600 though. Aircond water piping does not drip into the drainage instead via another piping into proper hole on the roof

Previously contractor suggested changing the whole drainage which costs $1200😡


Attached thumbnail(s)