System messages, including security (RACF) failures 2. **JESJCL** — Expanded JCL (with all symbolics resolved and procs expanded) 3. **JESYSMSG** — Allocation messages (look for IEF244I, IEF272I, IEF285I) 4. **Step condition codes** — In JESMSGLG, look for IEF142I messages 5. **SYSPRINT** — Program-