Means Integration: BCCD 2015 and TCCK 2015

SOLVED

We recently ran the Means integrator on our BCCD database and discovered that some items in the database with "U26..." Price Codes did not update.  We ran Transfer Data process first, using the BCCD 2015 and TCCK 2015 MIM files, to import new items into our BCCD database.  Then we ran the Update Data process; using the same MIM files to update the pricing.  Did some of the "U..." Price Codes get dropped in earlier versions of the BCCD and TCCK updates?  Is there documentation as to which price codes are changed