The error code -1660 is an internal error (kOCECorruptItemFound) which indicates a corruption was found in the either the Items file or the index to the Items file (ItemsBT). If the problem is in the ItemsBT file, this file can be deleted from the HFS folder, and the server will rebuild it upon restart. If the problem is in the Items file, there is nothing you can do to recover it. You will have to delete the folder from that server and re-replicate (if it was replicated). Otherwise, restore the folder from a backup.
The server only uses the reliable trans log while the server is running. This file is deleted when the server is shut down. It is therefore expected there is no Reliable Trans Log in the HFS folder for the catalog folder that is having the problem as you reported.