Would like to know the year my Rotax 912 ULS was built

Can I please have all details for the following Rotax 912UL?

• Production Date: 16.12.1991

  Warranty End Date: 16.12.1992

  No further information is available

Looking for information on S/N 3792610. How can I tell what gearbox is installed? 

3792610 was produced 10-Jul-1990

Additional details are not available for engines that pre-date the electronic database.

HI! I loud like to know any available info for s/n 4405846
Thank you!