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@Alb
Good article...
https://nsmb.com/articles/clean-your-brake-pistons/
Sounds like the pistons need some manual coaxing to move freely rather than a clean but the same methodology applies. You can do it with a syringe in the lever bleed port to relieve excess pressure off internal seals as you’re pushing pistons back as @TotalShanner says (just make sure it’s topped off with fluid to avoid sucking air)