For Month End Close, SubLedgers allow accounts to process, but the General Ledger gets errors. Why?

Summary:

We have run into issues with Subledger Period Close Exceptions again this month when trying to close. The AP issues have been fixed. The Project issues are not so easy. We tried to find where there are costs not transferred to the GL with no luck.  I do not see one of the reports (Journal Import Execution Report) as an option to run out there.  We believe that we are at the point where we need an urgent SR put in so that we can close the month unless you have other ideas that might help figure this out.