Hi Alexander,
As you are using kernel 741 for the procedure but as per error details your env parameter
ENV: rsdb_ssfs_connect=0
is with value 0.Here i suggest you to set the value of this parameter with 1 as kernel 741 supports only SSFS methods to connect the database.For more on SSFS please follow link SSFS Implementation for Oracle Database
After setting try try run R3trans -d from the upgrade directory and share the result for trans.log file and re try the phase again.
Hope this will solve your issue.
Regards,
Gaurav