this is the error "A 02 003 NVR checksum"


When I look at the error code its states that it is:
"Central office interface problem. Trunk Card Problem."

I know it says Trunk problem but the 003 isn't that mean equipment number, so when I look at the Equipment number table it shows that it would be an ONS card. So does it mean the card is SLOT 1 port 3 (ONS) is bad or does it mean CCT 3 on one of my trunk cards is bad.