Following up.  We called the IRS EFTPS and they acknowledged that the draft did not occur on 4/15.  However, it appears the 4/15 payment was bumped out to 6/15 as the IRS had it scheduled for that date.  We obviously cancelled that 6/15 payment because the client made the failed Q1 estimate. 

I wish we could have more transparency on the home base (or at least a report that can be run) for electronic payments.  That would have provided the visibility for practitioners to resolve these issues more quickly.