Briggs and Stratton repair manual needed.

Bought a John Deere E170 lawn tractor yesterday with a 25 HP Briggs and Stratton 2 cyl. vertical shaft engine.  My previous JD lawn tractor had a 23.5 HP Kohler 2 cyl. vert. shaft engine and the factory repair manual was no trouble to find.  I can't locate anywhere on the internet the repair manual for this engine and I_will_get one as I do all my own maintenance.  Model no. 44S9770044G1, ser. no. 1902154325559.  If anyone knows of a source for the factory repair manual for this engine, I would very much appreciate any assistance.  Thank you for your time and any help.