This video discusses an approach on using the DIS service logs, to correlate the name of the Mapping specification logs, to help debug the issues for failing mapping runs.
How to unassign services from an expired key and assign them to a valid key in 9.1.0 and 9.5.1
How to automate the repository and domain back up process for disaster recovery in PowerCenter
How to find in which host the Repository Integration service is running in a multi node domain