That's an NEC protocol with Device = 0x4B which is 64 + 11 = 75.
The Power Code is Function code 08.
For a description of this format and what you can do to generate all 256 codes for this device, see here...
[Link: remotecentral.com]Instead of using the modified NEC.irp file with the extra repeat sequence for MakeHex, you should use the standard NEC.irp file provided by Makehex but use a Device ID of 75 and Function 0..255.
Since your codes appear to work using shorthand, you can also change the 08F7 to 09F6, 0AF5, etc... in the code you posted.
Also, since you have shorthand, and most likely have learned all other buttons on the remote, you can exclude known codes such that you don't have to test a full 256 codes looking for hidden "discrete" codes.