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Did a pressure check on the vessel with the track pump and it doesn't register on the the pressure scale. So suspect the vessel needs repressurisation at the least.
Found a leak from a pipe that goes in to the ceiling travels somewhere and then appears about a meter away under the bath. Fucking hate the dodgy plumbing in France (well these houses, burying pipes and conduit in concrete without protection).
lynx
Sounds like the diaphragm is OK then, or you would have got water out.
How much air pressure is the important part.
With water pressure on, but heater switched off, run a hot tap for a few seconds to bleed off any over pressure.
Check the air pressure on the schrader valve. This will be the same as the water pressure/prv pressure on the other side of the diaphragm.
Switch off the water and run a hot tap. Repressurise the air to the same as the water pressure noted previously.
Turn on the water and heating again.
Any expansion above incoming pressure has maximum volume available before relieving.