Don't know for sure the answer but the following link might helps some. I did not see numbers for the 71, but they may be something there you can use.
<a href="http://www.442.com/oldsfaq/ofdif.htm#DIF%20Differential%20Codes" target="_blank">http://www.442.com/oldsfaq/ofdif.htm#DIF%20Differential%20Codes</a>
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