Message "pc_item - Unexpected case switch"

That particular error means that the 'modifiable' field in one of your items has an invalid value. 'Modifiable' is a logic field but apparently holds something besides '0', '1', or ' '. You may be able to find the erroneous item by simply looking through the items by hand. If not, design transfer the entire process to a temporary process, then start deleting the items one by one. This is a compile-time error so you can Opt 97 after each deletion.