Leaking metal roof

[perthian]

Good day helpful experts, I have a metal roof that's leaking.

I've been given options to 1) replace the whole roof or 2) to remove the screws and replace with metal patches and refasten with new screws to the ribs.

I'd like to pick the repair option as it's 1/6 the cost of roof replacement. Does it look like the repair will hold, if it's done properly by a roof tradesman? And what's the most durable type of screw Bunnings can recommend?

I've been told the roof screws have been installed wrongly on the pans/valleys rather than the ribs/ridges. And some of the rubber rings around the screws appear to be cracked. And one of the screws is even missing.

It's not common to put screws on the pans in Australia but in the US, that's recommended if the right screws are used so the sheets have less flex with strong winds (https://www.metalroofingsource.com/install-metal-roofing-fasteners/).

Thanks very much for any advice you'll be able to provide.

screw with cracked rubberscrews in pans instead of ribsscrews in pans instead of ribsroof has existing patchesmissing screw