We have a head office and 2 branch offices. Router1 in head office got 2 separate DS3 cards and got two DS3 links to two remote sites Router2 and Router3, each one on one DS3 card. Router1 DS3 card which is connected to Router2 gone faulty recently and we have changed it with new one. But since then link was taking heavy CRC errors at only Router1 side and Router2 is no errors.
Somany times has had troubleshooting session with telco, but no problem found when they give loop each side at a time. Changed cable between Router1 and demarc point and also changed Link from one DS3 card to second port of another DS3 card on Router1 (as link is taking errors at Router1 side only).
We did not change any thing at Router side.
Here below are the show controller, show run config of the interface & show interface commands output of both Router1 and Router2.
Pls help, as this issue is running more than 10 days. Thanks in advance.