Hello, this is my first question, actually 2 questions, here thank you for your help:

I have a 2003 Mitsubishi plasma monitor (remote RM-pdp1 with a sleep function) powered on/off by my Comcast remote via the red "All On" button and appears to be responding to TV code 1125.

My volume is controlled by a Yamaha receiver but I can't find the code through the search function so I'm controlling the volume with the receiver's remote.

My main question: IS IT POSSIBLE TO ASSIGN A SLEEP BUTTON TO MY COMCAST REMOTE THAT WILL POWER OFF the MONITOR and CABLEbox (I don't care about the receiver for the sleep function)

My second question: is there any way of getting the volume to function on my comcast remote?

Thank you kindly