Expansion vessel full of water

6 Jun 2005
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United Kingdom
My heating system has had a slow leak over a number of years requiring a water top up about once a month. I've finally located the leak, necessitating the floors to be lifted. I've now fixed the leak, but noticed that the pressure was still slowly dropping. I also noticed that there was a large rise in pressure when the boiler was running which then dropped when the boiler was off. I figured the expansion vessel might not be functioning properly. When I removed the vessel from the mount to access the Schrader valve, I noticed the vessel was very heavy. A push of the pin released a spray of water. Can the vessel be drained and reused or has that the diaphragm burst? I will get a repair man in for the repair but would like to supply the part (if required). Are there any on line sites you would recommend to buy spares?
The boiler in question is a Camray 5 Combi 90A. The expansion vessel is 12 litres but I cannot find a part number in the maintenance manual.
Thanks in advance for any help.
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