not sure if its them
But some plc even with the software have an hidden memory range / section, the programation goes in there and will ne be accessible for retrieval, even with a password ...
had a similar one in a pcb oven, and for sure the maker re-sold them to us at twice the price, still not aceessible by any means
the plc may have suffered more damages than you think, maybe its time to change it, and yeah you face the programming problem
is your equipment serviceable ? suppport tech ?