Hello, I am working on a project for a customer who is "repurposing" some RC5 Robots. The Robot Arms are VS-6556E/GM and the controllers are RC5-E BVSE6BA-BN. I was told these robots were functional when taken out of production. After boot, I get errors 6421, 6422, 6423, 6424, 6425, 6426 and 6427. These are all Encoder Data Not Received errors. I checked the batteries (all three are at about 3.6 volts), I tried three different cables, two different controllers, and two different robot arms. There is no undue noise. The robot arms and controllers have been sitting without power for about two months. Is there something that I am missing that is not in the manuals? Thank you in advance.