The pending transaction can be found by printing the warehoused ACH transactions (Tool # 693 "Print Warehoused ACH Transactions"). In this case there was a pending withdrawal for the member's 000 account.

It can be found on the PACHSU report as an invalid account. However, the program for pending transactions only uses the company ID and the Depositor Id to look up an entry in the ACHSUS and ACHDST file.  So that was enough information to see the P for Pending without actually being able to see the pending transaction.  Since like company IDs (records) are placed together, you would not be able to identify this transaction without referring to the PACHSU.