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That's great news. Yes you should be able to turn the hot water off and shut the isolation valve on the return off. If the pressure drop stops then it is the coil ( crossover ) in the cylinder that is the problem. The isolation valve that is fitted to the return was probably installed ( good...

No problem, If you just isolate the cylinder by turning the hot water off the motorised valve will shut off but water can stiil flow through the return pipe to the cylinder. Also the motorised valve may let by. So as you would have to fit an isolation valve on the return you might as well fit...

How old is the original system? I.e the rads not just the boiler. Was the boiler and main rads fitted new 10 years ago. A possibility is if there was and old boiler and radiator system that was open vented originally which had a sludge/air problem. Then your new 10 year old boiler ( Sealed...