Uncorrectables and T3 time outs

@EG​

I presently have the following uncorrectables on my modem, Arris sb6190: (channel-# of uncorrectables) 4-483; 12-2272; 13-40567; 14-34709; 15-21851; 16-26701; 17-27057. I also have multiple Priority-3 T3 time-outs. And my modem clock is ahead by 1 hour. I have no cable splitters. The modem is directly connected to Comcast cable all the way to the pole and perhaps beyond. Our house is at the end of the cable line. I am not a professional as most on this forum seem to be. How can I get Xfinity-Comcast to fix my line?