I HAVE A CUSTOMER THAT TOOK A LIGHTNING HIT ABOUT A MONTH AGO.I REPLACED THE CICS KSU AND
CID TRUNK CARD AND REPROGRAMMED THE SYSTEM TO
GET THEM BACK GOING.WITHIN A COUPLE OF DAYS THE
ALARM 51-2 WOULD SHOW UP AND WHEN THEY WOULD
ACCESS ANY OF THERE 3 CO LINES IT SAYS NOT
EQUIPPED.THE CUSTOMER CAN REBOOT THE SYSTEM
AND ACCESS THERE LINES AGAIN.I HAVE RETURNED
TO THE SITE AND REPLACED THE KSU AND CID TRUNK
CARD AGAIN AND ALSO REPLACED THE 7.1 SOFTWARE
MODULE.THEY NOW HAVE NEW SYSTEM EXCEPT FOR THE
TELEPHONES. ANY IDEAS,TNTJEFF

1st off, don't use CAPS. It means you're shouting. I'm not deaf.

A Trunk Module has been disconnected. Identify the module that caused the alarm. Power down the system. Check all connections to the Trunk Module. (Re-seat the card) If the problem persists, replace the cables.

funny i had 2 clients last week with the same problem