There's another stage you can go! The plastic moulding the pod fits into can be removed from the boiler casting. You need to rotate the moulding about 15° clockwise on the boiler using a bit of leverage between the trunions and the moulding both sides. It's rather stiff but once turned it releases a sort of bayonet fitting retaining the moulding to the boiler.
Inside there's another ‘O' ring, that can be suspect for a leak, and a plastic sleeve behind it.
There's another stage you can go! The plastic moulding the pod fits into can be removed from the boiler casting. You need to rotate the moulding about 15° clockwise on the boiler using a bit of leverage between the trunions and the moulding both sides. It's rather stiff but once turned it releases a sort of bayonet fitting retaining the moulding to the boiler.
Inside there's another ‘O' ring, that can be suspect for a leak, and a plastic sleeve behind it.