§ 6223. Vacating or modifying attachment. (a) Motion to vacate or modify. Prior to the application of property or debt to the satisfaction of a judgment, the defendant, the garnishee or any person having an interest in the property or debt may move, on notice to each party and the sheriff, for an order vacating or modifying the order of attachment. Upon the motion, the court may give the plaintiff a reasonable opportunity to correct any defect. If, after the defendant has appeared in the action, the court determines that the attachment is unnecessary to the security of the plaintiff, it shall vacate the order of attachment. Such a motion shall not of itself constitute an appearance in the action. (b) Burden of proof. Upon a motion to vacate or modify an order of attachment the plaintiff shall have the burden of establishing the grounds for the attachment, the need for continuing the levy and the probability that he will succeed on the merits.