Comb boiler losing pressure - tried everything!

Hi,

This is a right head scratcher! Any ideas greatly appreciated. My central heating system is losing about half a bar of pressure a week. It's a tiny back to back house, 4 rads and a towel rail. Veissman wb1b 30kw. Plastic piping. So far I've:

1. Ripped up the floorboards and run a finger over every single joint in the system, all the radiator valves, and the rads.

2. Bagged the pressure relief outlet.

3. Put a bit of cardboard under the boiler.

4. Replaced the expansion vessel.

5. Replaced the AAV.

6. Replaced the hw heat exchanger (was blocked).

7. Bled all the radiators.

And I still can't find where it's leaking. Is there anything else to try? Is it time for the f4?

Cheers!

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