welgo mg1's seized

hey! I got my mg1's last summer around May, they've seized up though. They never really spun for long on their own anyway, but now they are really stiff to turn. For example if I give the pedal a tap, it wont budge. Mechanically, I'm not very good. I've never serviced a pedal before, is it possible to fix these!? Or have I just got unlucky and my pedals are doomed!?
Thanks!
Thanks!
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I'd say 3-in-1 penetrating oil for really stuck things, but it's like super strength WD40 and could eat into the bearing grease. If you need to get the things off though, it's great stuff.