The attached link to a 3m 24s video shows start to finish of the replacement of a leaking Coolant Vent Hose on my 2017 35t F-Pace. If you notice a slow coolant leak check this part first.
Background: I had noticed coolant loss from Max to Min mark on the reservoir over 8,000 miles. Fearing the worst that it was failure of the lower outlet ('Y') pipe's flanged joints (plenty of threads on this), I had it pressure tested at the dealership. The test passed but they noticed a small weep from the vent hose that connects the reservoir to the radiator header tank at the tank quick connect. Photos attached. Since this was easily accessible I did the replacement myself.
My time: < 4 minutes including hood opening and removal of the engine cover.
My cost: $52.81 partnumber T4A1783, $22 1 gallon coolant (that wasn't needed).
Dealership quote: $395.36 including 1h.6hrs labor of $321.30 @$199.99/hr
Preemptive comment: I am aware that dealerships have a minimum labor time charge (e.g. 1 hr) to cover check-in and paperwork etc.


Circled leak connection

Evidence of leak at joint

 

well done!