Great Plains conversion to MEM - A/P sub ledger does not tie to GL

Recently I converted from GP to MEM and the A/P sub ledger does not equal the GL from inception, June of this year to date. I am looking for a consultant who can find the differences and propose a solution. As June through September financials have already been locked and presented I am looking make all fixes in October of November as a ytd fix. This project needed to be completed by November 30th. There is some flexibility. The company is located in NYC greater area and can be done remotely. The budget is very limited to get the project completed.