I am looking for some help with my RS-232 ports.

I have a total of 10 machines, all with Fanuc Controls. During a recent Thunderstorm, we got hit my lighting. Two of my mills and three of my lathes will not transfer files through the RS-232 ports.

The mills are 10M's and the lathes are OT's and a 10L.

I have verified my cables and scanner box and am communicating with my other machines ok.

How best can I trouble shoot my problem?
Do I just change boards?
Does anyone have a good source for boards?
Can someone tell me which boards I should be looking at?