Fuji servo IS70B board error codes?

We're still trying to fix a C-axis overflow error in our CP-65. I was swapping servo boards and one of them started to blinks a 2 on the LED single digit display and the machine didn't boot up. I replaced the servo board with a spare we bought on ebay for the original problem (it didn't fix the original problenm) and now it boots up. If I swap servo boards 1 and 2 the C-axis error goes away but we get either nozzle origin errors (st12), or some error with the nozzles at st17 and 19. These errors didn't show up before we swapped the boards (1 and 2). This is sooooo frustrating!. So if anyone can help with the questions below, I would greatly ... thank you:

1. What does a blinking "2" mean 2. What are the error codes for these servos 3. If you have a CP-65: Does it matter the revision of the servo boards (and firmware)? 4. If you have a CP-65: What revision and firmware version do your IS70B servo boards have?

Thank you, thank you very much. Have a great weekend!

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