The Oracle Server X5-2L Service Manual provides product-specific information about troubleshooting problems; refer to Troubleshooting and Diagnostics in Oracle Server X5-2L Service Manual.
The Oracle x86 Servers Diagnostics, Applications, and Utilities Guide provides information about a wide variety of tools available for Oracle's x86 servers. Go to https://www.oracle.com/goto/x86admindiag/docs.
Knowledge articles, white papers, and product updates are available through the Oracle Support portal at https://support.oracle.com.