Without having the opportunity to read the specific court order or knowing all the details surrounding your case, it's challenging to provide a definitive answer on whether you need to go back to court to have your deposit applied towards the $4200 you've been ordered to pay. Typically, the process and expectations for fulfilling a court order, including the application of deposits towards amounts owed, should be outlined in the order itself.
If the court order does not specify how the deposit is to be handled, or if there is a disagreement between you and your landlord about applying the deposit to the amount owed, you might need to seek a further court order. If you feel that the deposit was not handled properly after the court order, I would suggest speaking with an attorney to discuss your situation.
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