That's like saying "My car doesn't run - can someone tell me why?" The answer could range from "it's out of fuel" to "the engine is seized."
This is a Speedmaster reduced, so if you look at the Omega web site in whatever country you are in, under the service section it should list current pricing for chronograph servicing. The reality is that Omega will most likely replace the movement with a rebuilt one, and send the one in this watch off to the factory to be rebuilt and put in someone else's watch somewhere in the world.
Cheers, Al
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