The debtor must initiate a contested proceeding by filing a motion to obtain a court order to avoid a judicial lien or other transfer of exempt property. (11 USC 522(f); FRBP 4003(d), 7001(2), 9014) The debtor may reopen the bankruptcy case after discharge in order to avoid a lien if the delay has not prejudiced the lienholder. (In re Costello, 72 BR 841; In re Quackenbos, 71 BR 693; In re Skakalski, 67 BR 448)