Leaking antifreeze expansion tank or hose ?

[CLS70]

New = <<Left
Old = Right>>

The Old one was hardened and less flexible

[Big Smoke]

My leak was tank. Twice into the dealer while under warranty? They could not find any issues. @$195/hr. Topped up the closed system and sent me on my way.
Two weeks out of warranty. Leaking and my 12 old found the leak.
New tank $9o & a cap $18. 2o min and an engine compartment clean.
Only issue was getting that fitting on the bottom of the tank to release. Size 8 hands in a size 4 space.