"I was performing professionally at age 17 and have never had a real job." Allen Vizzutti
If they move freely but are just hard to press down I doubt corrosion or grime is the problem otherwise they wouldn't move freely, they would move stickily and intermittently but not freely. Now maybe they don't actually move freely, I haven't looked at the horn in question, but it sounds like someone put in new springs and didn't use the proper spings when replacing the old ones. They may be too long, too high tension, too thick of gauge, or too tightly wound. Not all trumpet springs are the same ladies and gentlemen and they are not universal.
How long should the springs be roughly? These ones are just under twice the length of the spring casing.
There is no set rule on how long they should be but twice the length is too long. Those are not the factory springs, they are replacements installed by someone who doesn't know what they are doing.
Your best bet is to take it to a reputable tech and have them check it out. New springs should be pretty cheap and they can diagnose the horn much better than I can from the States over the internet.
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