Ando - They are push fit, so very easy. But are you sure it’s a hole? It’s not very clear from the picture - At least I can’t see it.
Watch from 3:00 and it show you how to remove it.
So you could buy some PTFE tubbing (from ebay) and, as long as they are the same outer diameter and inner diameter, you should be good.
Question: With the machine open, steam boiler on and at full pressure… If it’s a hole, them steam will be escaping from it. Can you confirm this?