Saeco machine only dispensing half the coffee

I have the Xelsis Suprema SM8889/00, which we bought a year ago.

Starting a couple months ago, when I brew a coffee, I only get a fraction of the quantity requested. For example, I made a 220ml coffee, but only got 125ml in the cup, and measured the remaining 95ml of water in the drip tray!

However, if I make a cup of hot water, I get the full amount.

It should also be noted that the liquid in the drip tray is water, not coffee.

I've tried resetting the machine to factory settings, running the descale twice, running the coffee oil removal twice, and cleaning and greasing the brew group. Nothing has solved the problem.

The only other option is to send it in for service but if there is an easy way to fix it myself at home I'd much rather that. Any ideas?

Brew group seal or support valve defective.
Water can also run into the drip tray via the pressure relief valve after the pump.
Strainer Brew group closed?
Does the pump become quieter when you draw coffee?

thanks! the pump seems to sound ok, so I guess if it's like you say, Brew group seal or support valve defective, it will need to go in for repair.

This will be the second repair in the year since we bought it so I"m inclined to ask for a new machine. For what these machines cost I don't want a repaired one!