I just talked to the Mechanic, he says it is an 04, and he performed a node learn.He is going to replace the HN board, and expansion board. He thinks that since this is a 3 car group, that he has 2 master cars and 1 slave car, the HN board he is changing is on the slave car. He also indicated that the Building people say the Elevators go on Emergency Service and Fire Service for no apparent reason periodically. Yikes!!! I wish I was still working so I stress over these animals.