Here is the link for advanced/discrete codes for your Kenwood receiver. I didn’t see any discrete power codes, but it looks as if there are discrete input codes which may work. Assign setup code 0027 to the AMP key on your 2103, and then you can test the codes in this list to see if they work.
I think you can keymove any needed discrete codes using the 0027 setup code, and then go back to the 1313 code for control of your receiver.
[Link: hifi-remote.com]See this thread for the keymover procedures
[Link: remotecentral.com]<>
edmund-please check me out on these and make any corrections you need to. Thanks again, Ron