Goldengate replicat: how to back fill data of UPDATE operations

 the IGNOREUPDATE parameter was used to get around an issue in a Goldengate replicat. Unfortunately it was not turned off. So UPDATE data were not loaded to the target tables. The trail files are still available. To back fill the data of UPDATE operation, I am wondering if I can make a copy of the prm file and build a new replicat by adding some syntax to specially process the UPDATE data. Hope to get some help how I can do it. Thanks a lot.