Diagnostics Aid messages and codesEdit online The following topics describe the messages and codes of FABPDIAG. Diagnostics Aid return codesFABPDIAG contains the following return codes:Diagnostics Aid abend codesAll 36xx abend codes are accompanied by an FABU36xx message. Refer to the appropriate message for problem determination.Diagnostics Aid messagesUse the information in these messages to diagnose and solve FABPDIAG problems.Parent topic: Diagnostics Aid