That is for a full service on a A7750. Completely tearing the movement apart, cleaning it and reassembling it with 5 different kinds of oil/lube.
If it is some thing simple, then it is going to be cheaper then that. Was working on another members watch over the weekend that had just stopped... After de-casing the movement I remove the balance..the hacking lever had broken off from the sliding pinion and was wedged up against the balance wheel. Pulled the broken hacking lever piece out and reinstalled the balance...she fired right up.
From my limited experience there are a couple of piece in the chrono working that easy failures and when they go, they get lodged into the balance causing the movement to stop.