All the information should be on the blockchain, and you should only need the TransactionID from the transaction that moved the coins from Wallet A to Wallet B...
This should show the change address(es) that had the coins left over from the 175 BTC. It should be a simple matter to follow back from that (A to B) transaction to see that those change address(es) are indeed from the 175 BTC transaction.
Not sure why you would need a "pro" to show that? Unless there were a number of transactions inbetween "175->Exchange" and "A to B"?
