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That 10 and 51 does not refer to a script line number but to the type of disconnect that happens.
'10' happens when the server has a data update to send to the client and finds that the client is no longer there.
'51' happens as part of the regular 'tickle' that the client sends the server every minute or so. If the server has not received a tickle from a client in a while it decides that the user has dropped off