go back over it,,,, fine tooth comb type of going over it. look for bad bearings, loose bolts in the suspension (front and rear), make sure your idler wheels are good, grease it again,,, I assume they fogged the motor, cleaned the clutches, inspected the chain and sprockets as well as changed the chaincase oil.
Find out what they did for sure, then do what they didnt as well as you final checks,,,
One other thing you might wanna check is your power valves for free movement and cables for correct length, they seem to over look this area and also your oil if it is a diamond drive it should be done yearly not every 5000K.
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