Not your typical coolant leak

[Aidzer0]

Hello fellow outposters, we will be talking about a 2006 X5 N62 4.4l AWD Auto today.

https://xoutpost.com/bmw-sav-forums/...ing-sound.html
Recently I repaired a catastrophic front diff failure (linked above), which was mostly successful. Prior to the diff failing, I was doing the regular BMW preventative maintenance, the cooling system. I started with the leaking components, which was the exp tank, thermostat and VDO temp sensors (PO had aftermarket which was causing the gauge to report incorrectly), that went successfully. I then followed up with the small black transfer pipe (Between block and waterpump) and waterpump. Where I left the cooling system for the time being, a couple of days later I noticed a puddle of coolant (small drips)

After the diff failure, I noticed that the water pump was leaking (two weeks after replacing) the leak is coming from between the WP housing and the block, which doesn't really make sense to me since its all new and OEM... I torqued the bolts correctly too (10.5nm). Is there a special procedure that I needed to install it in or do I need to get a new water pump gasket? (Its from FCP so I have lifetime warranty on it)

Notes: It's not the valley pan hose leak, that was fixed with the bimmerfix pipe and sealant.

Thanks all!