If you have actively failed workers, try "dig.pl" to get the worker and sub-log errors quickly!
There is a perl script, for 11i through 12.1 called "dig.pl", provided with the EBS Patch Log Parser:
E-Business Suite Patching Log Parser (adpatch 11i, 12.0, 12.1) (Doc ID 1590231.1)
This script can quickly get errors from worker logs and push those errors into a text file.
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