The APYJRNCHG command can be used to restore the file to it’s orignal values.
There are certain restrictions. You can find them by doing an F4 on the APYJRNCHG command then doing an F1.
Also here is a link to IBM info on Journal Management.
If this is not possible, you can use RTVJRNE to build a file of all the jouirnal records and then write a program to use whatever data you need.