The first error is for a latch problem, while the second is still the keypad problem. If the buttons aren't accepting input, I guess programing the board is not going to happen. As for the latch problem, there may be a daughter board next to the control board. This controls both latches, so make sure it is connected properly. When you first turn on the breaker, both door locks should cycle to find their home position so if either one isn't working, that would be the reason for the first error. As for the ribbon cable, to verify continuity through each wire, I use a set of sharp probes on my meter and pierce the insulation on either side of where I believe the break to be. If you don't have continuity, then that may be a problem. Usually, when a wire breaks, it only affects one matrix of buttons and not the entire thing. But if several of the wires broke, that would explain why it isn't working. Many of these panels would get mounted with the ribbon cable folded over, then with time and expansion, the buttons would stop working. Sometimes you can try moving the cable to see if any electrical contact is being made. But if any of the wires is broken, there isn't a good way to repair it.