I do not use the standard ProSeries letter.  I have created my own custom and in it is is a line requesting the client to verify the banking info (I do NOT pay client tax payments, let them pay it and save me the malpractice issue when it blows up).  The letter code I use is:

[@FDIBank]<@FDIBank>, routing #[@FDIRTN]<@FDIRTN>, account #[@FDIAcctNo]<@FDIAcctNo>