It translates to 3513:1225
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Connecting to the share with the users credentials would not be a valid test, the credentials to test are the ones specified in the script for the drvmap command.
Already checked the certs, the correct one is in the WINPE image
You say you tried to map to the share from a machine in that location, but have you tried it through WinPE? When the mapping fails in WinPE open up a console and do a net use and try to map using the same account.