Roland HP3500s repair help

I have removed all the keys and cleaned out the dust etc with a microfibre cloth,
two keys following putting the unit back together are still playing intermittently, different parts of pressing the key work and then dont work. I think the issue could be the rubber contact underneath ? are these easy to replace is this the problem or could it be something else. I have tried to clean the rubber,
Where can I get a key removal tool as I dont want to have to take the whole thinga part again. I am in the UK London

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