Rca rt2770 home theater universal remote code

Question

i just bought an RCA RT2770 home theater system. and i cant find a working code to program my comcast 3 in 1 universal remote. i've found a couple rca codes, but none of them work, and all comcast's website says to do is do a manual seach with the remote. but after 15mins of dilligent searching my fingers got tired and i gave up. please help me find a working code to program my comcast remote to work with my rca home theater system!