Db, 747 is a nice tool to use! I use mine next to a 1198 and a 1155.
I would not try the si transducer, the SI ducer produces a 180' beam and the 747 ducer has a much smaller cone type beam. I suspect that there would be too much return data for the 747 to process.
Don't know for sure maybe Greg can help?
Hope for a fast repair turnaround at HB repair!!
Roddy