I would take them apart as mentioned above it's very easy. Clean them well and check them for nicks or burrs on the blade, sharpen them on the angled side and give a final light swipe on the flat side to make sure it is completely flat. Lubricate and re-assemble.
Have you thought of calling Felco and asking if there are any local stockists? For exmaple, the Wisley plant centre used to have a display board with each type attached so that you could try the different pairs for comfort and ease of use.
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