Lectrician
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Lightening is forever frying Versatilities. The line cards fail for a past time.
You could try swapping the black PSTN modules for new, but to be honest, with a fried system, you are best swapping the CCU and the modules. Faults will likely start to appear over time otherwise.
For the price of a second user system with cards, it is worth swapping the lot (although the black PSTN cards can be more expensive than the red ISDN ones). Beware of ones on Ebay - They are often ones which have been hit by lightening, and show no immediate issues, but will fail in time.
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