Hi, That is an old process panel so it might be difficult to repair or fix it easy.
1. There is a kind of diagnostic of the panel, but I don't think it will help so much: " The diagnostic page is activated by pressing the key combination [ ← ] and [PREV] simultaneously in RUN mode" 2. There is a possibility to download a system program to the panel by means of the tool " PC program System Loader", part of Process Panel builder. In this case you will need the system program file, e.g. PP245xxx.bin. 3. The other possibility is to try download the complete project to the panel with Process Panel builder and see if that could fix the problem.