Software rarely has Modbus maps for the equipment; the manual for the device normally has the Modbus map, if it's not separate communications manual.
The 735 is a GE Multilin product.
The 735 / 737 Feeder Protection Relay Instruction Manual has the Modbus memory map.
The manual is listed as GEK-106291F 735/737 Instruction Manual for product version 1.56 (Rev. DK), at the web site below.
You have to register (and confirm your email address) in order to download that manual. https://www.gegridsolutions.com/app/viewfiles.aspx?prod=735737&type=3
