hopefully you have this problem resolved by now?
but generally if the interlock and the neutral light flash both simultaneously?

All this is telling you is that both the lift and drive interlock is activated because the seat switch is not activated, all functions are disabled.

Don't just check the switch, you should check the wiring under the seat all the way to the connector on the right hand side under the hood. Look underneath the seat cushion and see the wires going to the switch, make sure they are plugged in and the harness is not chaffed in any way. There is an open circuit somewhere.

good luck