Took 2001 XLT 1200 yamaha jet ski in for service at yamaha licensed dealer. They replaced impeller due to performance issues, charged me $165 for service, total $800. Then informed me that the engine will not turn over manually, that the engine is locked up. How could a service be performed without starting the engine? They told me the first thing they do is start the jet ski but this time they did not do that. Am I being cheated here? What should I be aware of?