Hi there. First post here; hoping someone can help. I have a Yamaha HTR-4065 and am trying to get a code to control my Comcast (Cisco) RNG-150N cable box. I've tried the following codes listed in the Yamaha manual:

Comcast: 3084, 3088, 3117
Motorola: 3025, 3026, 3084, 3088, 3090, 3095, 3117

Unfortunately none of the codes control power, channel changing, anything. I'm guessing I'm SOL, but figured I'd see if any of you guys have any ideas outside of guessing four digit codes for days. Thanks for any input!